let vs lum, What's the Difference?

Which to use

“let” is a verb and “lum” is a noun - they look or sound alike but fill different roles in a sentence.

#228
“let” frequency rank: #47,736
“lum” frequency rank: 47964
confusion score

Side-by-Side Comparison

Feature	let	lum
Definition	To allow to, not to prevent (+ infinitive, but usually without to).	A chimney; also, the top part of a chimney.

Where the eye mixes let and lum

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

3 ch

let

3 ch

lum

Why the eye confuses let with lum

These two trip readers on the page rather than in the ear: let is /lɛt/ while lum is /lʌm/. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (verb vs noun), which is usually the fastest check. Our composite confusion score for this pair is 47964, derived from the frequency rank of both members and their visual similarity.

let is recorded at frequency rank #228, classified as averb, pronounced /lɛt/. lum is at rank #47,736, tagged as anoun, pronounced /lʌm/.

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 47964, this pair ranks #197,574 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of let vs lum

Shared letters: l. Private to "let": et. Private to "lum": mu.

"let" · 3 letters · shape CVC · "lum" · 3 letters · shape CVC

Frequently Asked Questions

Do "let" and "lum" mean the same thing in a sentence?

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

Which is more common, "let" or "lum"?

"let" is the more common of the two: it sits at frequency rank #228 in our English list, against #47,736 for "lum". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

What to do next

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

Full dictionary entry for "let" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "lum" - compare definitions side by side with the headword page. Word entry
This pair ranks #197,574 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"let" and "lum" also get mixed up with nearby pairs, the highest-scored neighbour is "LSC vs lum". Nearby pair

Confusion rank #197,574 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.