idesvsislesTell them apart

Which to use

“ides” and “isles” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#42,389
“ides” frequency rank
#36,912
“isles” frequency rank
79301
confusion score

Side-by-Side Comparison

Feature ides isles
Definition Le quinzième jour des mois de mars, de mai, de juillet et d’octobre dans le calendrier des anciens Romains, et le treizième des autres mois. Pluriel de isle.

Where the eye mixes ides and isles

Muted = shared; highlighted = the visual trap. They share 3 letters in sequence.

4 ch
ides
5 ch
isles

Look-alike desk: ides vs isles

A purely visual mix-up. ides (\id\) and isles (\il\) 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 79301, derived from the frequency rank of both members and their visual similarity.

ides is recorded at frequency rank #42,389, classified as anoun, pronounced \id\. isles is at rank #36,912, tagged as anoun, pronounced \il\.

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 79301, this pair ranks #23,631 of 440,172 scored French confusable pairs - among the most confusable pairs.

Orthographic DNA of ides vs isles

Shared letters: eis. Private to "ides": d. Private to "isles": l.

"ides" · 4 letters · shape VCVC  ·  "isles" · 5 letters · shape VCCVC

Known mistypes of this pair

  • idesiddes · idess · ieds
  • islesilses · isels · isless · islles · islse · issles · siles

Frequently Asked Questions

Can "ides" and "isles" be used interchangeably?
No. They are said differently (\id\ versus \il\) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.
In ordinary French text, does "ides" or "isles" show up more?
"isles" is the more common of the two: it sits at frequency rank #36,912 in our French list, against #42,389 for "ides". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.

  • Full dictionary entry for "ides" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "isles" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #23,631 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
  • "ides" and "isles" also get mixed up with nearby pairs, the highest-scored neighbour is "ides vs ime". 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 #23,631 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.

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

Source: FrequencyWords open word-frequency list