first vs FISA, What's the Difference?

Which to use

“first” is an adjective and “FISA” is a name - they look or sound alike but fill different roles in a sentence.

#81
“first” frequency rank: #32,399
“FISA” frequency rank: 32480
confusion score

Side-by-Side Comparison

Feature	first	FISA
Definition	Preceding all others of a series or kind; the ordinal of one; earliest.	Acronym of Foreign Intelligence Surveillance Act.

Letter map: first vs FISA

Shared letters muted; letters that set first and FISA apart highlighted. Shared run: 3.

5 ch

first

4 ch

FISA

Part-of-speech tell for first / FISA

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: first is anadjective and FISAaname. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 32480, derived from the frequency rank of both members and their visual similarity.

first is recorded at frequency rank #81, classified as anadj, pronounced /fɜːst/. FISA is at rank #32,399, tagged as aname.

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 32480, this pair ranks #337,457 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of first vs FISA

Shared letters: fis. Private to "first": rt. Private to "FISA": a.

"first" · 5 letters · shape CVCCC · "FISA" · 4 letters · shape CVCV

Known mistypes of this pair

first ← ffirst · firrst · firsst · firstt · firts · fisrt · frist · ifrst
FISA ← ffisa · fias · fissa · fsia · ifsa

Frequently Asked Questions

Is swapping "first" for "FISA" ever safe?

No - they are not even the same part of speech. "first" is an adjective and "FISA" a name, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "first" or "FISA"?

"first" is the more common of the two: it sits at frequency rank #81 in our English list, against #32,399 for "FISA". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

What to do next

You've compared "first" and "FISA". Here's where to go from here.

Full dictionary entry for "first" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "FISA" - compare definitions side by side with the headword page. Word entry
This pair ranks #337,457 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"first" and "FISA" also get mixed up with nearby pairs, the highest-scored neighbour is "FISA vs fossa". 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 #337,457 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.