IcavsillaWhich spelling fits?

Quick tell: Ica is a name, illa is a noun, so they fill different roles in a sentence.

Which to use

“Ica” is a name and “illa” is a noun - they look or sound alike but fill different roles in a sentence.

#17,449
“Ica” frequency rank
#41,407
“illa” frequency rank
58856
confusion score

Side-by-Side Comparison

Feature Ica illa
Definition Ciudad peruana; capital del departamento homónimo. Isla.

Where the eye mixes Ica and illa

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.

3 ch
Ica
4 ch
illa

Why the eye confuses Ica with illa

These two trip readers on the page rather than in the ear: Ica is [ˈika] while illa is [ˈi.ʎə]. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (name vs noun), which is usually the fastest check. Our composite confusion score for this pair is 58856, derived from the frequency rank of both members and their visual similarity.

Ica is recorded at frequency rank #17,449, classified as aname, pronounced [ˈika]. illa is at rank #41,407, tagged as anoun, pronounced [ˈi.ʎə].

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 58856, this pair ranks #64,887 of 323,831 scored Spanish confusable pairs - among the most confusable pairs.

Orthographic DNA of Ica vs illa

Shared letters: ai. Private to "Ica": c. Private to "illa": l.

"Ica" · 3 letters · shape VCV  ·  "illa" · 4 letters · shape VCCV

Known mistypes of this pair

  • illaila · ilal

Frequently Asked Questions

Is swapping "Ica" for "illa" ever safe?
No - they are not even the same part of speech. "Ica" is a name and "illa" a noun, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "Ica" or "illa"?
"Ica" is the more common of the two: it sits at frequency rank #17,449 in our Spanish list, against #41,407 for "illa". 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 "Ica" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "illa" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #64,887 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
  • "Ica" and "illa" also get mixed up with nearby pairs, the highest-scored neighbour is "illa vs iza". Nearby pair
  • Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes

Confusion rank #64,887 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