bel vs by, What's the Difference?

Which to use

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

#16,644
“bel” frequency rank: #24
“by” frequency rank: 16668
confusion score

Side-by-Side Comparison

Feature	bel	by
Definition	A measure of relative power, defined as log₁₀(P ₁/P ₂), where P₁ and P₂ are the measured and reference power respectively.	Near or next to.

Where the eye mixes bel and by

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

3 ch

bel

2 ch

Visual trap between bel and by

These two trip readers on the page rather than in the ear: bel is /bɛl/ while by is /baɪ/. 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 (noun vs preposition), which is usually the fastest check. Our composite confusion score for this pair is 16668, derived from the frequency rank of both members and their visual similarity.

bel is recorded at frequency rank #16,644, classified as anoun, pronounced /bɛl/. by is at rank #24, tagged as aprep, pronounced /baɪ/.

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 16668, this pair ranks #456,299 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of bel vs by

Shared letters: b. Private to "bel": el. Private to "by": y.

"bel" · 3 letters · shape CVC · "by" · 2 letters · shape CV

Frequently Asked Questions

Is swapping "bel" for "by" ever safe?

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

In ordinary English text, does "bel" or "by" show up more?

"by" is the more common of the two: it sits at frequency rank #24 in our English list, against #16,644 for "bel". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

After this comparison

Eye-level mix-up between "bel" and "by" is sorted above. Next: full entries or other pairs that share a letter shape.

Full dictionary entry for "bel" 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 #456,299 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"bel" and "by" also get mixed up with nearby pairs, the highest-scored neighbour is "bel vs BFS". Nearby pair

Confusion rank #456,299 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.