ICD vs ies, What's the Difference?

Which to use

“ICD” and “ies” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#34,926
“ICD” frequency rank: #45,988
“ies” frequency rank: 80914
confusion score

Side-by-Side Comparison

Feature	ICD	ies
Definition	Initialism of implantable cardioverter-defibrillator.	plural of i, the name of the letter I.

Letter map: ICD vs ies

Shared letters muted; letters that set ICD and ies apart highlighted. Shared run: 1. ICD (VCC) and ies (VVC) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.

3 ch

ICD

3 ch

ies

Pair insight - ICD / ies

ICD and ies are indexed as a confusable English pair. We have no recorded pronunciation or part of speech for both members, so the spelling overlap is what we can show you: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 80914, derived from the frequency rank of both members and their visual similarity.

ICD is recorded at frequency rank #34,926, classified as anoun. ies is at rank #45,988, tagged as anoun.

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 80914, this pair ranks #18,801 of 530,003 scored English confusable pairs - among the most confusable pairs.

Orthographic DNA of ICD vs ies

Shared letters: i. Private to "ICD": cd. Private to "ies": es.

"ICD" · 3 letters · shape VCC · "ies" · 3 letters · shape VVC

Frequently Asked Questions

Is swapping "ICD" for "ies" ever safe?

No. They share most of their letters but differ in 2 positions, but the dictionary glosses above give them different meanings, so swapping one for the other changes what the sentence says.

Frequency check: "ICD" vs "ies" - which ranks higher?

"ICD" is the more common of the two: it sits at frequency rank #34,926 in our English list, against #45,988 for "ies". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Done with this confusable. These links stay specific to "ICD" and "ies".

Full dictionary entry for "ICD" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "ies" - compare definitions side by side with the headword page. Word entry
This pair ranks #18,801 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"ICD" and "ies" also get mixed up with nearby pairs, the highest-scored neighbour is "ies vs ith". Nearby pair

Confusion rank #18,801 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.