boo vs by, What's the Difference?

Which to use

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

#25,911
“boo” frequency rank: #2,462
“by” frequency rank: 28373
confusion score

Side-by-Side Comparison

Feature	boo	by
Definition	Bouh.	Fossé qui traverse un étang, aboutissant à sa bonde.

Where the eye mixes boo and by

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

3 ch

boo

2 ch

Look-alike desk: boo vs by

These two trip readers on the page rather than in the ear: boo is \ˈbu\ while by is \bi\. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (intj vs noun), which is usually the fastest check. Our composite confusion score for this pair is 28373, derived from the frequency rank of both members and their visual similarity.

boo is recorded at frequency rank #25,911, classified as anintj, pronounced \ˈbu\. 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 28373, this pair ranks #323,236 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of boo vs by

Shared letters: b. Private to "boo": o. Private to "by": y.

"boo" · 3 letters · shape CVV · "by" · 2 letters · shape CV

Frequently Asked Questions

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

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

In ordinary French text, does "boo" or "by" show up more?

"by" is the more common of the two: it sits at frequency rank #2,462 in our French list, against #25,911 for "boo". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.

Full dictionary entry for "boo" 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 #323,236 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
"boo" and "by" also get mixed up with nearby pairs, the highest-scored neighbour is "bold vs boo". Nearby pair

Confusion rank #323,236 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.