Which to use
“first” is an adjective and “FIS” is a noun - they look or sound alike but fill different roles in a sentence.
- #81
- “first” frequency rank
- #40,245
- “FIS” frequency rank
- 40326
- confusion score
Side-by-Side Comparison
| Feature | first | FIS |
|---|---|---|
| Definition | Preceding all others of a series or kind; the ordinal of one; earliest. | Initialism of flight information service. |
Letter map: first vs FIS
Shared letters muted; letters that set first and FIS apart highlighted. Shared run: 3.
Part-of-speech tell for first / FIS
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: first is anadjective and FISanoun. On the page they differ by 2 letter(s) in length. Our composite confusion score for this pair is 40326, derived from the frequency rank of both members and their visual similarity.
first is recorded at frequency rank #81, classified as anadj, pronounced /fɜːst/. 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 40326, this pair ranks #268,618 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of first vs FIS
Shared letters: fis. Private to "first": rt. Private to "FIS": -.
"first" · 5 letters · shape CVCCC · "FIS" · 3 letters · shape CVC
Known mistypes of this pair
- first ← ffirst · firrst · firsst · firstt · firts · fisrt · frist · ifrst
Frequently Asked Questions
Do "first" and "FIS" mean the same thing in a sentence?
Which is more common, "first" or "FIS"?
What to do next
Pair "first" vs "FIS" is on the table, pick a follow-up below.
- Full dictionary entry for "first" 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 #268,618 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "first" 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 #268,618 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.