foivsFOIAWhat's the difference?

Quick tell: foi is a noun, FOIA is a name, so they fill different roles in a sentence.

Which to use

“foi” is a noun and “FOIA” is a name - they look or sound alike but fill different roles in a sentence.

#42,644
“foi” frequency rank
#33,247
“FOIA” frequency rank
75891
confusion score

Side-by-Side Comparison

Feature foi FOIA
Definition A depiction of a handshake. Acronym of Freedom of Information Act.

Letter map: foi vs FOIA

Shared letters muted; letters that set foi and FOIA apart highlighted. Shared run: 3. foi runs 3 letters (CVV) against FOIA's 4 (CVVV) - the length gap alone is often enough to separate them once you know to check it.

3 ch
foi
4 ch
FOIA

Part-of-speech tell for foi / FOIA

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: foi is anoun and FOIAaname. On the page they differ by 1 extra letter(s) - “foi” sits inside “FOIA”. Our composite confusion score for this pair is 75891, derived from the frequency rank of both members and their visual similarity.

foi is recorded at frequency rank #42,644, classified as anoun. FOIA is at rank #33,247, tagged as aname, pronounced /ˈfɔɪjə/.

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 75891, this pair ranks #31,739 of 530,003 scored English confusable pairs - among the most confusable pairs.

Orthographic DNA of foi vs FOIA

Shared letters: fio. Private to "foi": -. Private to "FOIA": a.

"foi" · 3 letters · shape CVV  ·  "FOIA" · 4 letters · shape CVVV

Known mistypes of this pair

  • FOIA ← ffoia · fioa · foai · ofia

Frequently Asked Questions

Is swapping "foi" for "FOIA" ever safe?
No - they are not even the same part of speech. "foi" is a noun and "FOIA" a name, so a sentence built for one is usually ungrammatical with the other.
In ordinary English text, does "foi" or "FOIA" show up more?
"FOIA" is the more common of the two: it sits at frequency rank #33,247 in our English list, against #42,644 for "foi". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

You've compared "foi" and "FOIA". Here's where to go from here.

  • Full dictionary entry for "foi" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "FOIA" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #31,739 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
  • "foi" and "FOIA" also get mixed up with nearby pairs, the highest-scored neighbour is "foi vs FOMO". 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 #31,739 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list