Which to use
“mer” and “mm” are a confusable Spanish pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #21,067
- “mer” frequency rank
- #2,511
- “mm” frequency rank
- 23578
- confusion score
Side-by-Side Comparison
| Feature | mer | mm |
|---|---|---|
| Definition | Mar. | Abreviatura de milímetro. |
Where the eye mixes mer and mm
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Why the eye confuses mer with mm
A purely visual mix-up. mer ([mɛʁ]) and mm ([ˈm]) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 23578, derived from the frequency rank of both members and their visual similarity.
mer is recorded at frequency rank #21,067, classified as anoun, pronounced [mɛʁ]. mm is at rank #2,511, tagged as anoun, pronounced [ˈm].
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 23578, this pair ranks #245,131 of 323,831 scored Spanish confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of mer vs mm
Shared letters: m. Private to "mer": er. Private to "mm": -.
"mer" · 3 letters · shape CVC · "mm" · 2 letters · shape CC
Frequently Asked Questions
Is swapping "mer" for "mm" ever safe?
Frequency check: "mer" vs "mm" - which ranks higher?
Useful next steps
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "mer" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "mm" - compare definitions side by side with the headword page. Word entry
- This pair ranks #245,131 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
- "mer" and "mm" also get mixed up with nearby pairs, the highest-scored neighbour is "mer vs mur". Nearby pair
Confusion rank #245,131 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.