bi vs bis, What's the Difference?

Which to use

“bi” is an adjective and “bis” is a preposition - they look or sound alike but fill different roles in a sentence.

#7,501
“bi” frequency rank: #14,300
“bis” frequency rank: 21801
confusion score

Side-by-Side Comparison

Feature	bi	bis
Definition	bissexual	até

Letter map: bi vs bis

Shared letters muted; letters that set bi and bis apart highlighted. Shared run: 2.

2 ch

3 ch

bis

Role in the sentence - bi and bis

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: bi is anadjective and bisapreposition. On the page they differ by 1 extra letter(s) - “bi” sits inside “bis”. Our composite confusion score for this pair is 21801, derived from the frequency rank of both members and their visual similarity.

bi is recorded at frequency rank #7,501, classified as anadj. bis is at rank #14,300, tagged as aprep.

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 21801, this pair ranks #48,375 of 75,631 scored Portuguese confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of bi vs bis

Shared letters: bi. Private to "bi": -. Private to "bis": s.

"bi" · 2 letters · shape CV · "bis" · 3 letters · shape CVC

Frequently Asked Questions

Can "bi" and "bis" be used interchangeably?

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

Frequency check: "bi" vs "bis" - which ranks higher?

"bi" is the more common of the two: it sits at frequency rank #7,501 in our Portuguese list, against #14,300 for "bis". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Done with this confusable. These links stay specific to "bi" and "bis".

Full dictionary entry for "bi" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "bis" - compare definitions side by side with the headword page. Word entry
This pair ranks #48,375 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"bi" and "bis" also get mixed up with nearby pairs, the highest-scored neighbour is "bile vs bis". Nearby pair

Confusion rank #48,375 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.