Which to use
“icy” is an adjective and “ISR” is a noun - they look or sound alike but fill different roles in a sentence.
- #14,141
- “icy” frequency rank
- #49,434
- “ISR” frequency rank
- 63575
- confusion score
Side-by-Side Comparison
| Feature | icy | ISR |
|---|---|---|
| Definition | Pertaining to, resembling, or abounding in ice; cold; frosty. | Initialism of interrupt service routine. |
Letter map: icy vs ISR
Shared letters muted; letters that set icy and ISR apart highlighted. Shared run: 1. icy (VCV) and ISR (VCC) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Role in the sentence - icy and ISR
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: icy is anadjective and ISRanoun. On the page they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 63575, derived from the frequency rank of both members and their visual similarity.
icy is recorded at frequency rank #14,141, classified as anadj, pronounced /ˈaɪsi/. ISR is at rank #49,434, 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 63575, this pair ranks #82,218 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of icy vs ISR
Shared letters: i. Private to "icy": cy. Private to "ISR": rs.
"icy" · 3 letters · shape VCV · "ISR" · 3 letters · shape VCC
Frequently Asked Questions
Is swapping "icy" for "ISR" ever safe?
Frequency check: "icy" vs "ISR" - which ranks higher?
Useful next steps
You've compared "icy" and "ISR". Here's where to go from here.
- Full dictionary entry for "icy" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "ISR" - compare definitions side by side with the headword page. Word entry
- This pair ranks #82,218 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "icy" and "ISR" also get mixed up with nearby pairs, the highest-scored neighbour is "ISR vs ith". Nearby pair
Confusion rank #82,218 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.