bis vs boa, What's the Difference?

Which to use

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

#14,300
“bis” frequency rank: #165
“boa” frequency rank: 14465
confusion score

Side-by-Side Comparison

Feature	bis	boa
Definition	até	jiboia

Letter map: bis vs boa

Shared letters muted; letters that set bis and boa apart highlighted. Shared run: 1.

3 ch

bis

3 ch

boa

Role in the sentence - bis and boa

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: bis is apreposition and boaanoun. On the page they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 14465, derived from the frequency rank of both members and their visual similarity.

bis is recorded at frequency rank #14,300, classified as aprep. boa is at rank #165, tagged as anoun, pronounced /ˈbo.ɐ/.

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 14465, this pair ranks #57,605 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of bis vs boa

Shared letters: b. Private to "bis": is. Private to "boa": ao.

"bis" · 3 letters · shape CVC · "boa" · 3 letters · shape CVV

Frequently Asked Questions

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

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

In ordinary Portuguese text, does "bis" or "boa" show up more?

"boa" is the more common of the two: it sits at frequency rank #165 in our Portuguese list, against #14,300 for "bis". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

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

Full dictionary entry for "bis" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "boa" - compare definitions side by side with the headword page. Word entry
This pair ranks #57,605 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"bis" and "boa" also get mixed up with nearby pairs, the highest-scored neighbour is "bile vs bis". Nearby pair

Confusion rank #57,605 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.