ISA vs its, What's the Difference?

Which to use

“ISA” is a noun and “its” is a determiner - they look or sound alike but fill different roles in a sentence.

#13,178
“ISA” frequency rank: #75
“its” frequency rank: 13253
confusion score

Side-by-Side Comparison

Feature	ISA	its
Definition	Initialism of instruction set architecture.	Belonging to it.

Where the eye mixes ISA and its

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.

3 ch

ISA

3 ch

its

Visual trap between ISA and its

These two trip readers on the page rather than in the ear: ISA is /ˈaɪsə/ while its is /ɪts/. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (noun vs determiner), which is usually the fastest check. Our composite confusion score for this pair is 13253, derived from the frequency rank of both members and their visual similarity.

ISA is recorded at frequency rank #13,178, classified as anoun, pronounced /ˈaɪsə/. its is at rank #75, tagged as adet, pronounced /ɪts/.

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 13253, this pair ranks #476,870 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of ISA vs its

Shared letters: is. Private to "ISA": a. Private to "its": t.

"ISA" · 3 letters · shape VCV · "its" · 3 letters · shape VCC

Frequently Asked Questions

Is swapping "ISA" for "its" ever safe?

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

In ordinary English text, does "ISA" or "its" show up more?

"its" is the more common of the two: it sits at frequency rank #75 in our English list, against #13,178 for "ISA". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

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

Full dictionary entry for "ISA" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "its" - compare definitions side by side with the headword page. Word entry
This pair ranks #476,870 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"ISA" and "its" also get mixed up with nearby pairs, the highest-scored neighbour is "Ilan vs ISA". Nearby pair

Confusion rank #476,870 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.