Which to use
“infinite” is an adjective and “infinity” is a noun - they look or sound alike but fill different roles in a sentence.
- #5,507
- “infinite” frequency rank
- #9,350
- “infinity” frequency rank
- 14857
- confusion score
Side-by-Side Comparison
| Feature | infinite | infinity |
|---|---|---|
| Definition | Indefinably large, countlessly great; immense. | endlessness, unlimitedness, absence of a beginning, end or limits to size. |
Where the eye mixes infinite and infinity
Muted = shared; highlighted = the visual trap. They share 7 letters in sequence.
Why the eye confuses infinite with infinity
These two trip readers on the page rather than in the ear: infinite is /ˈɪnfᵻnɪt/ while infinity is /ɪnˈfɪnɪti/. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - e in “infinite” becomes y in “infinity”, and the parts of speech differ too (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 14857, derived from the frequency rank of both members and their visual similarity.
infinite is recorded at frequency rank #5,507, classified as anadj, pronounced /ˈɪnfᵻnɪt/. infinity is at rank #9,350, tagged as anoun, pronounced /ɪnˈfɪnɪti/.
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 14857, this pair ranks #467,549 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of infinite vs infinity
Shared letters: fint. Private to "infinite": e. Private to "infinity": y.
"infinite" · 8 letters · shape VCCVCVCV · "infinity" · 8 letters · shape VCCVCVCV
Known mistypes of this pair
Frequently Asked Questions
Can "infinite" and "infinity" be used interchangeably?
Frequency check: "infinite" vs "infinity" - which ranks higher?
What to do next
Eye-level mix-up between "infinite" and "infinity" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "infinite" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "infinity" - compare definitions side by side with the headword page. Word entry
- This pair ranks #467,549 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "infinite" and "infinity" also get mixed up with nearby pairs, the highest-scored neighbour is "indignity vs infinity". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #467,549 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.