lull vs lum, What's the Difference?

Which to use

“lull” and “lum” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#26,150
“lull” frequency rank: #47,736
“lum” frequency rank: 73886
confusion score

Side-by-Side Comparison

Feature	lull	lum
Definition	A period of rest or soothing.	A chimney; also, the top part of a chimney.

Where the spellings diverge

Shared letters are muted; the letters that actually set lull and lum apart are highlighted. They share 2 letters in sequence, which is exactly why the eye skips the difference.

4 ch

lull

3 ch

lum

Spelling & Dictionary Insight

A purely visual mix-up. lull (/lʌl/) and lum (/lʌm/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 73886, derived from the frequency rank of both members and their visual similarity.

lull is recorded at frequency rank #26,150, classified as anoun, pronounced /lʌl/. 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 73886, this pair ranks #38,097 of 530,003 scored English confusable pairs - among the most confusable pairs.

Orthographic DNA of lull vs lum

Shared letters: lu. Private to "lull": -. Private to "lum": m.

"lull" · 4 letters · shape CVCC · "lum" · 3 letters · shape CVC

Known mistypes of this pair

lull ← llul · llull · ulll

Frequency comparison

lull#26,150

lum#47,736

Source: FrequencyWords open word-frequency list

Frequently Asked Questions

Can "lull" and "lum" be used interchangeably?

No. They are said differently (/lʌl/ versus /lʌm/) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.

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

"lull" is the more common of the two: it sits at frequency rank #26,150 in our English list, against #47,736 for "lum". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Remembering lull vs lum

The fastest way to pick the right one every time.

Read both glosses above and match the meaning you intend, only context separates this pair.
See each word in full, definition, IPA, etymology and its other confusables. Full “lull” entry
Browse more pairs most likely to be confused. Most confusable