bu vs by, What's the Difference?

Which to use

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

#5,636
“bu” frequency rank: #2,462
“by” frequency rank: 8098
confusion score

Side-by-Side Comparison

Feature	bu	by
Definition	Absorbé, en parlant d’un liquide ou de sentiment (les sentiments étaient autrefois considérés comme des humeurs, au sens propre de quelque chose d’humide).	Fossé qui traverse un étang, aboutissant à sa bonde.

Letter map: bu vs by

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

2 ch

Grammar separator: bu vs by

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: bu is anadjective and byanoun. On the page they differ by a single letter - u in “bu” becomes y in “by”. Our composite confusion score for this pair is 8098, derived from the frequency rank of both members and their visual similarity.

bu is recorded at frequency rank #5,636, classified as anadj. by is at rank #2,462, tagged as anoun, pronounced \bi\.

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 8098, this pair ranks #421,145 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of bu vs by

Shared letters: b. Private to "bu": u. Private to "by": y.

"bu" · 2 letters · shape CV · "by" · 2 letters · shape CV

Frequently Asked Questions

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

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

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

"by" is the more common of the two: it sits at frequency rank #2,462 in our French list, against #5,636 for "bu". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

After this comparison

You've compared "bu" and "by". Here's where to go from here.

Full dictionary entry for "bu" 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 #421,145 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
"bu" and "by" also get mixed up with nearby pairs, the highest-scored neighbour is "bu vs bury". Nearby pair

Confusion rank #421,145 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.