bi vs by, What's the Difference?

Which to use

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

#7,501
“bi” frequency rank: #1,598
“by” frequency rank: 9099
confusion score

Side-by-Side Comparison

Feature	bi	by
Definition	bissexual	por;

Letter map: bi vs by

Shared letters muted; letters that set bi and by apart highlighted. Shared run: 1.

2 ch

Role in the sentence - bi and by

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: bi is anadjective and byapreposition. On the page they differ by a single letter - i in “bi” becomes y in “by”. Our composite confusion score for this pair is 9099, derived from the frequency rank of both members and their visual similarity.

bi is recorded at frequency rank #7,501, classified as anadj. by is at rank #1,598, 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 9099, this pair ranks #64,451 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of bi vs by

Shared letters: b. Private to "bi": i. Private to "by": y.

"bi" · 2 letters · shape CV · "by" · 2 letters · shape CV

Frequently Asked Questions

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

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

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

"by" is the more common of the two: it sits at frequency rank #1,598 in our Portuguese list, against #7,501 for "bi". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

Pair "bi" vs "by" is on the table, pick a follow-up below.

Full dictionary entry for "bi" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "by" - compare definitions side by side with the headword page. Word entry
This pair ranks #64,451 of 75,631 scored Portuguese confusable pairs in this corpus vintage. Corpus statistics
"bi" and "by" also get mixed up with nearby pairs, the highest-scored neighbour is "bi vs bile". Nearby pair

Confusion rank #64,451 of 75,631 scored Portuguese pairs, corpus vintage 2026-09-03, not spelling advice.