ISS vs its, What's the Difference?

Which to use

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

#16,055
“ISS” frequency rank: #75
“its” frequency rank: 16130
confusion score

Side-by-Side Comparison

Feature	ISS	its
Definition	Initialism of International Space Station.	Belonging to it.

Letter map: ISS vs its

Shared letters muted; letters that set ISS and its apart highlighted. Shared run: 2.

3 ch

ISS

3 ch

its

Grammar separator: ISS vs its

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: ISS is aname and itsadeterminer. On the page they differ by a single letter - s in “ISS” becomes t in “its”. Our composite confusion score for this pair is 16130, derived from the frequency rank of both members and their visual similarity.

ISS is recorded at frequency rank #16,055, classified as aname. 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 16130, this pair ranks #459,693 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of ISS vs its

Shared letters: is. Private to "ISS": -. Private to "its": t.

"ISS" · 3 letters · shape VCC · "its" · 3 letters · shape VCC

Frequently Asked Questions

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

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

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

"its" is the more common of the two: it sits at frequency rank #75 in our English list, against #16,055 for "ISS". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

Done with this confusable. These links stay specific to "ISS" and "its".

Full dictionary entry for "ISS" 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 #459,693 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"ISS" and "its" also get mixed up with nearby pairs, the highest-scored neighbour is "ISS vs ith". Nearby pair

Confusion rank #459,693 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.