Which to use
“fires” and “FIS” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #5,417
- “fires” frequency rank
- #40,245
- “FIS” frequency rank
- 45662
- confusion score
Side-by-Side Comparison
| Feature | fires | FIS |
|---|---|---|
| Definition | plural of fire | Initialism of flight information service. |
Letter map: fires vs FIS
Shared letters muted; letters that set fires and FIS apart highlighted. Shared run: 3. fires runs 5 letters (CVCVC) against FIS's 3 (CVC) - the length gap alone is often enough to separate them once you know to check it.
Pair insight - fires / FIS
fires and FIS are indexed as a confusable English pair. We have no recorded pronunciation or part of speech for both members, so the spelling overlap is what we can show you: they differ by 2 letter(s) in length. Our composite confusion score for this pair is 45662, derived from the frequency rank of both members and their visual similarity.
fires is recorded at frequency rank #5,417, classified as anoun, pronounced /ˈfaɪ̯ə(ɹ)z/. 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 45662, this pair ranks #219,103 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of fires vs FIS
Shared letters: fis. Private to "fires": er. Private to "FIS": -.
"fires" · 5 letters · shape CVCVC · "FIS" · 3 letters · shape CVC
Known mistypes of this pair
- fires ← ffires · fiers · firess · firres · firse · ifres
Frequently Asked Questions
Is swapping "fires" for "FIS" ever safe?
Frequency check: "fires" vs "FIS" - which ranks higher?
After this comparison
You've compared "fires" and "FIS". Here's where to go from here.
- Full dictionary entry for "fires" 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 #219,103 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "fires" 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 #219,103 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.