belvsbyTell them apart

Quick tell: bel is a noun, by is a preposition, so they fill different roles in a sentence.

Which to use

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

#20,282
“bel” frequency rank
#2,381
“by” frequency rank
22663
confusion score

Side-by-Side Comparison

Feature bel by
Definition Unidad para medir diversas magnitudes con una escala logarítmica, como la sonoridad, intensidad, atenuación y otras. A, en.

Where the eye mixes bel and by

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

3 ch
bel
2 ch
by

Visual trap between bel and by

These two trip readers on the page rather than in the ear: bel is [ˈbel] while by is [bɛi]. 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 22663, derived from the frequency rank of both members and their visual similarity.

bel is recorded at frequency rank #20,282, classified as anoun, pronounced [ˈbel]. by is at rank #2,381, tagged as aprep, pronounced [bɛi].

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 22663, this pair ranks #249,294 of 323,831 scored Spanish 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 Spanish text, does "bel" or "by" show up more?
"by" is the more common of the two: it sits at frequency rank #2,381 in our Spanish list, against #20,282 for "bel". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

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 #249,294 of 323,831 scored Spanish 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 Bru". Nearby pair

Confusion rank #249,294 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list