milvsmuyWhich spelling fits?

Quick tell: mil is a adjective, muy is an adverb, so they fill different roles in a sentence.

Which to use

“mil” is an adjective and “muy” is an adverb - they look or sound alike but fill different roles in a sentence.

#379
“mil” frequency rank
#46
“muy” frequency rank
425
confusion score

Side-by-Side Comparison

Feature mil muy
Definition Diez veces ciento. Expresa grado intenso, extenso o de abundancia de la característica del adjetivo o adverbio al que precede y es caracterizado como un adverbio de cantidad o modo..

Where the eye mixes mil and muy

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

3 ch
mil
3 ch
muy

Why the eye confuses mil with muy

These two trip readers on the page rather than in the ear: mil is [ˈmil] while muy is [ˈmuj]. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (adjective vs adverb), which is usually the fastest check. Our composite confusion score for this pair is 425, derived from the frequency rank of both members and their visual similarity.

mil is recorded at frequency rank #379, classified as anadj, pronounced [ˈmil]. muy is at rank #46, tagged as anadv, pronounced [ˈmuj].

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 425, this pair ranks #323,434 of 323,831 scored Spanish confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of mil vs muy

Shared letters: m. Private to "mil": il. Private to "muy": uy.

"mil" · 3 letters · shape CVC  ·  "muy" · 3 letters · shape CVV

Frequently Asked Questions

Is swapping "mil" for "muy" ever safe?
No - they are not even the same part of speech. "mil" is an adjective and "muy" an adverb, so a sentence built for one is usually ungrammatical with the other.
Frequency check: "mil" vs "muy" - which ranks higher?
"muy" is the more common of the two: it sits at frequency rank #46 in our Spanish list, against #379 for "mil". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

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

  • Full dictionary entry for "mil" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "muy" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #323,434 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
  • "mil" and "muy" also get mixed up with nearby pairs, the highest-scored neighbour is "mil vs mur". Nearby pair

Confusion rank #323,434 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