IEP vs is, What's the Difference?

Which to use

“IEP” is a noun and “is” is a verb - they look or sound alike but fill different roles in a sentence.

#45,987
“IEP” frequency rank: #8
“is” frequency rank: 45995
confusion score

Side-by-Side Comparison

Feature	IEP	is
Definition	Initialism of isoelectric point.	third-person singular simple present indicative of be

Letter map: IEP vs is

Shared letters muted; letters that set IEP and is apart highlighted. Shared run: 1. IEP runs 3 letters (VVC) against is's 2 (VC) - the length gap alone is often enough to separate them once you know to check it.

3 ch

IEP

2 ch

Part-of-speech tell for IEP / is

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: IEP is anoun and isaverb. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 45995, derived from the frequency rank of both members and their visual similarity.

IEP is recorded at frequency rank #45,987, classified as anoun. is is at rank #8, tagged as averb, pronounced /ɪz/.

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 45995, this pair ranks #215,990 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of IEP vs is

Shared letters: i. Private to "IEP": ep. Private to "is": s.

"IEP" · 3 letters · shape VVC · "is" · 2 letters · shape VC

Frequently Asked Questions

Is swapping "IEP" for "is" ever safe?

No - they are not even the same part of speech. "IEP" is a noun and "is" a verb, so a sentence built for one is usually ungrammatical with the other.

Frequency check: "IEP" vs "is" - which ranks higher?

"is" is the more common of the two: it sits at frequency rank #8 in our English list, against #45,987 for "IEP". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

Pair "IEP" vs "is" is on the table, pick a follow-up below.

Full dictionary entry for "IEP" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "is" - compare definitions side by side with the headword page. Word entry
This pair ranks #215,990 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"IEP" and "is" also get mixed up with nearby pairs, the highest-scored neighbour is "IEP vs ith". Nearby pair

Confusion rank #215,990 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.