Which to use
“fair” is an adjective and “FIS” is a noun - they look or sound alike but fill different roles in a sentence.
- #1,104
- “fair” frequency rank
- #40,245
- “FIS” frequency rank
- 41349
- confusion score
Side-by-Side Comparison
| Feature | fair | FIS |
|---|---|---|
| Definition | Beautiful, of a pleasing appearance, with a pure and fresh quality. | Initialism of flight information service. |
Letter map: fair vs FIS
Shared letters muted; letters that set fair and FIS apart highlighted. Shared run: 2. fair runs 4 letters (CVVC) against FIS's 3 (CVC) - the length gap alone is often enough to separate them once you know to check it.
Role in the sentence - fair and FIS
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: fair is anadjective and FISanoun. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 41349, derived from the frequency rank of both members and their visual similarity.
fair is recorded at frequency rank #1,104, classified as anadj, pronounced /fɛə/. FIS is at rank #40,245, 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 41349, this pair ranks #259,279 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of fair vs FIS
Shared letters: fi. Private to "fair": ar. Private to "FIS": s.
"fair" · 4 letters · shape CVVC · "FIS" · 3 letters · shape CVC
Known mistypes of this pair
- fair ← afir · fairr · fari · ffair · fiar
Frequently Asked Questions
Is swapping "fair" for "FIS" ever safe?
Which is more common, "fair" or "FIS"?
Useful next steps
Done with this confusable. These links stay specific to "fair" and "FIS".
- Full dictionary entry for "fair" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "FIS" - compare definitions side by side with the headword page. Word entry
- This pair ranks #259,279 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "fair" and "FIS" also get mixed up with nearby pairs, the highest-scored neighbour is "FIS vs foh". 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 #259,279 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.