Which to use
“locum” and “lum” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #47,732
- “locum” frequency rank
- #47,736
- “lum” frequency rank
- 95468
- confusion score
Side-by-Side Comparison
| Feature | locum | lum |
|---|---|---|
| Definition | Ellipsis of locum tenens. | A chimney; also, the top part of a chimney. |
Where the eye mixes locum and lum
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence. locum runs 5 letters (CVCVC) against lum's 3 (CVC) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses locum with lum
A purely visual mix-up. locum (/ˈləʊkəm/) 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 2 letter(s) in length. Our composite confusion score for this pair is 95468, derived from the frequency rank of both members and their visual similarity.
locum is recorded at frequency rank #47,732, classified as anoun, pronounced /ˈləʊkəm/. 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 95468, this pair ranks #955 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of locum vs lum
Shared letters: lmu. Private to "locum": co. Private to "lum": -.
"locum" · 5 letters · shape CVCVC · "lum" · 3 letters · shape CVC
Known mistypes of this pair
- locum ← lcoum · llocum · loccum · locmu · locumm · loucm · olcum
Frequently Asked Questions
Can "locum" and "lum" be used interchangeably?
Which is more common, "locum" or "lum"?
After this comparison
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "locum" 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 #955 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "locum" and "lum" also get mixed up with nearby pairs, the highest-scored neighbour is "LSC vs lum". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #955 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.