marvsmuWhat's the difference?

Which to use

“mar” and “mu” are a confusable Spanish pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#674
“mar” frequency rank
#9,685
“mu” frequency rank
10359
confusion score

Side-by-Side Comparison

Feature mar mu
Definition Cuerpo de agua salada que rodea los continentes de la Tierra. Onomatopeya del mugido o bramido de un bovino.

Where the eye mixes mar and mu

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

3 ch
mar
2 ch
mu

Why the eye confuses mar with mu

A purely visual mix-up. mar ([ˈmaɾ]) and mu ([ˈmu]) 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 10359, derived from the frequency rank of both members and their visual similarity.

mar is recorded at frequency rank #674, classified as anoun, pronounced [ˈmaɾ]. mu is at rank #9,685, tagged as anoun, pronounced [ˈmu].

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 10359, this pair ranks #298,918 of 323,831 scored Spanish confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of mar vs mu

Shared letters: m. Private to "mar": ar. Private to "mu": u.

"mar" · 3 letters · shape CVC  ·  "mu" · 2 letters · shape CV

Frequently Asked Questions

Can "mar" and "mu" be used interchangeably?
No. They are said differently ([ˈmaɾ] versus [ˈmu]) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.
In ordinary Spanish text, does "mar" or "mu" show up more?
"mar" is the more common of the two: it sits at frequency rank #674 in our Spanish list, against #9,685 for "mu". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

What to do next

Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.

  • Full dictionary entry for "mar" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "mu" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #298,918 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
  • "mar" and "mu" also get mixed up with nearby pairs, the highest-scored neighbour is "mu vs mur". Nearby pair

Confusion rank #298,918 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list