IED vs is, What's the Difference?

Which to use

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

#32,440
“IED” frequency rank: #8
“is” frequency rank: 32448
confusion score

Side-by-Side Comparison

Feature	IED	is
Definition	Initialism of Intelligent Electronic Device, a sensor, actuator, or PLC used as part of a SCADA system.	third-person singular simple present indicative of be

Where the eye mixes IED and is

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

3 ch

IED

2 ch

Why the eye confuses IED with is

These two trip readers on the page rather than in the ear: IED is /ˌaɪ iː ˈdiː/ while is is /ɪz/. 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 (noun vs verb), which is usually the fastest check. Our composite confusion score for this pair is 32448, derived from the frequency rank of both members and their visual similarity.

IED is recorded at frequency rank #32,440, classified as anoun, pronounced /ˌaɪ iː ˈdiː/. 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 32448, this pair ranks #337,744 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of IED vs is

Shared letters: i. Private to "IED": de. Private to "is": s.

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

Frequently Asked Questions

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

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

In ordinary English text, does "IED" or "is" show up more?

"is" is the more common of the two: it sits at frequency rank #8 in our English list, against #32,440 for "IED". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

Eye-level mix-up between "IED" and "is" is sorted above. Next: full entries or other pairs that share a letter shape.

Full dictionary entry for "IED" 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 #337,744 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"IED" and "is" also get mixed up with nearby pairs, the highest-scored neighbour is "IED vs ith". Nearby pair

Confusion rank #337,744 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.