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A simile compares two different things using “like” or “as” (her voice was like honey). A metaphor makes the same comparison without those words, saying one thing simply is the other (her voice was honey). Both point out a likeness between things that are not alike on the surface. The simile keeps the comparison in plain view; the metaphor folds it away and asks the reader to make the jump.
That is the whole difference, and most of the time the word like or as settles it. The cases that cause trouble are the ones where “like” appears but nothing figurative is happening, and the metaphors that never use “is” at all. Both are covered below, along with 15 images written each way, famous lines from poems and plays, advice on choosing between the two, and a short quiz.
Simile vs metaphor at a glance
| Simile | Metaphor | |
|---|---|---|
| What it does | Says A is like B | Says A is B, or treats A as if it were B |
| Signal words | like, as, as … as, sometimes than or as if | None needed |
| Example | The classroom was like a zoo. | The classroom was a zoo. |
| Effect | Clear and a little more careful: the reader sees two things side by side | Stronger and more compressed: the two things merge |
| Can name the shared quality? | Often does: as cold as ice | Usually leaves it implied |
| Can run for a whole paragraph? | Rarely | Yes, as an extended metaphor |
The word origins match the definitions. Simile comes from the Latin similis, “like”, the same root as similar. Metaphor comes from the Greek metapherein, “to carry over”: the meaning of one thing is carried across to another.
The quick test, and where it fails
Ask two questions:
- Are two unlike things being compared? If not, it is neither a simile nor a metaphor, just a literal statement.
- Is the comparison made with like, as or a similar word? If yes, it is a simile. If the sentence says or implies that one thing is the other, it is a metaphor.
The first question is the one people skip. These sentences contain “like” or “as” but are not similes:
- She looks like her mother. A literal resemblance between two people. Nothing figurative.
- I like strong coffee. “Like” is a verb here.
- Cities like Paris and Rome are expensive. “Like” means “such as”.
- He works as a nurse. “As” gives his job, not a comparison.
Compare them with she sings like a nightingale: a person and a bird are unlike things, and the sentence borrows one quality (sweet, effortless singing) from the bird. That is a simile.
The second trap is assuming a metaphor needs “is”. Many do not:
- Verb metaphors: She sailed through the exam. The news shattered him. Rumours crawled through the office.
- Noun-phrase metaphors: a sea of faces, a mountain of paperwork, the heart of the city.
- Adjective metaphors: a frosty reply, a razor-sharp mind.
None of these says “X is Y”, but each treats one thing as another (an exam as water, faces as a sea, a reply as frost), so each is a metaphor.
15 images written both ways (30 examples)
Here is the same idea as a simile and then as a metaphor. Read across each row and notice what changes: the metaphor is shorter and more certain; the simile is gentler and leaves both halves of the comparison visible.
| # | Simile | Metaphor |
|---|---|---|
| 1 | Her smile was like sunshine. | Her smile was sunshine. |
| 2 | The classroom was as noisy as a zoo. | The classroom was a zoo. |
| 3 | Time is like a thief that takes our years. | Time is a thief. |
| 4 | He was as brave as a lion. | He was a lion in battle. |
| 5 | Her words cut like a knife. | Her words were a knife. |
| 6 | The snow lay like a white blanket over the field. | A white blanket of snow covered the field. |
| 7 | My mind was like a fog this morning. | My mind was a fog this morning. |
| 8 | Life is like a rollercoaster. | Life is a rollercoaster. |
| 9 | The city at night glittered like a jewel box. | The city at night was a jewel box. |
| 10 | His heart felt as heavy as stone. | He had a heart of stone. |
| 11 | The traffic moved like a snail. | The traffic crawled. |
| 12 | She was as busy as a bee all day. | She was a busy bee all day. |
| 13 | Ideas flowed like water once she started. | Ideas flowed once she started. |
| 14 | The exam felt like a mountain to climb. | The exam was a mountain to climb. |
| 15 | The room was as cold as a freezer. | The room was a freezer. |
Rows 11 and 13 show a verb metaphor: crawled and flowed treat traffic as an animal and ideas as water without ever naming the animal or the water. Row 10 shows that the two versions do not always say exactly the same thing: “felt as heavy as stone” describes sadness, while “a heart of stone” usually means coldness or cruelty. Fixed expressions carry their own meanings, so check them before swapping one for the other.
Famous similes and metaphors
Writers have used both for centuries, and many of the best-known lines in English are one or the other.
| Line | Source | Device | What it compares |
|---|---|---|---|
| “O my Luve is like a red, red rose” | Robert Burns, “A Red, Red Rose” (1794) | Simile | Love and a rose: fresh, beautiful, newly in bloom |
| “I wandered lonely as a cloud” | William Wordsworth, “I Wandered Lonely as a Cloud” (1807) | Simile | The poet and a cloud drifting alone |
| “All the world’s a stage, / And all the men and women merely players” | Shakespeare, As You Like It | Metaphor (extended) | Life and a play, with people as actors |
| “It is the east, and Juliet is the sun” | Shakespeare, Romeo and Juliet | Metaphor | Juliet and the sun: bright, life-giving, the centre of Romeo’s world |
| “Hope is the thing with feathers / That perches in the soul” | Emily Dickinson (published 1891) | Metaphor (extended) | Hope and a small bird that keeps singing |
Burns could have written “my love is a red, red rose”, and the line would still work. With “like”, the speaker sounds as if he is reaching for the right comparison, which suits a love song. Shakespeare’s “Juliet is the sun” has no such hesitation: to Romeo, in that moment, she simply is the sun. That difference in tone is the most useful thing to understand about the two devices.
Which should you use?
Neither is better. They do different jobs.
Choose a simile when:
- The comparison is surprising and the reader needs a signal that you mean it figuratively. “The meeting was like a hostage negotiation” is clear; “the meeting was a hostage negotiation” could be misread as fact.
- You want to name the shared quality. “As patient as a heron” tells the reader exactly which part of the heron matters.
- The tone should be light or tentative, as in conversation, humour or a narrator who is unsure.
- Your readers are young or learning English. The signal word makes the figurative meaning easier to catch.
Choose a metaphor when:
- You want force. “Her office was a fortress” is more decisive than “her office was like a fortress”.
- You want to keep the image going. A metaphor can be extended: the project was a ship, and by March it was taking on water; the managers bailed, the engineers patched, and nobody asked who had steered it into the rocks. A string of similes would trip over its own “likes”.
- You want to save words. A verb metaphor (“she bulldozed the objections”) does the work of a full sentence.
A good rule for a draft: if a simile feels limp, try deleting “like” and see whether the metaphor holds. If a metaphor feels confusing or overstated, add “like” back. For hundreds of ready-made comparisons on single topics, see our collections of similes for love and metaphors for love, which treat the same subject in each form.
Similes, metaphors and their neighbours
Similes and metaphors belong to the larger family of figurative language. Three relatives are often confused with them:
- Analogy is a comparison used to explain or argue, usually at greater length: “A cell is like a factory: the nucleus is the manager’s office, the ribosomes are the assembly lines…” An analogy can use similes and metaphors as its parts.
- Personification is a kind of metaphor that treats a thing as a person: “the wind whispered”, “the old car groaned up the hill”.
- Hyperbole is exaggeration. It often travels with a simile (“as big as a house”) or a metaphor (“he’s a giant”), but the device itself is the overstatement, not the comparison.
Some older writers do not separate the two at all. Aristotle, in his Rhetoric, treats the simile as a form of metaphor that differs only in how it is put. Modern English teaching keeps them apart because the “like/as” test is easy to apply and because the two feel different on the page.
Common mistakes
- Calling every “like” a simile. “He looks like his brother” is literal. A simile needs two unlike things.
- Missing metaphors without “is”. “The plan collapsed” and “a flood of complaints” are metaphors; buildings collapse and water floods.
- Mixing metaphors. “We’ll have to nip this in the bud before it snowballs into a firestorm” asks the reader to picture a plant, a snowball and a fire in one breath. Pick one image and stay with it.
- Relying on tired comparisons. “As busy as a bee” and “a heart of gold” are understood instantly, which is their strength in speech and their weakness in writing that should feel fresh. When you browse a list such as our similes for happy, skip the first one that comes to mind and look for the one your reader has not heard.
- Explaining the comparison to death. “Her smile was sunshine, because it was warm and bright and made people feel good” undoes the metaphor. Trust the reader.
Quiz: simile, metaphor or neither?
- The stars were diamonds scattered across the sky.
- He eats like a horse.
- She looks like her grandmother.
- My little brother is a walking encyclopedia.
- The lake was as smooth as glass.
- The teacher’s words stung.
- I like reading on the train.
- Her laugh was like a bell ringing in an empty hall.
- The city never sleeps.
- He was as quiet as a mouse during the test.
Answers
- Metaphor: stars are called diamonds.
- Simile: “like” compares a person’s appetite with a horse’s.
- Neither: a literal family resemblance.
- Metaphor: a boy cannot be an encyclopedia.
- Simile: “as … as” compares the lake with glass.
- Metaphor: words are treated as something that can sting.
- Neither: “like” is a verb.
- Simile: a laugh compared with a bell.
- Metaphor, and specifically personification: a city cannot sleep.
- Simile: “as … as” with a mouse.
If you scored well and want to practise writing your own, take a subject from our metaphors for life or metaphors for time pages, write it once as a simile and once as a metaphor, and read both aloud. The version that sounds like something you would actually say is usually the right one.