Which to use
“locum” is a noun and “Lou” is a name - they look or sound alike but fill different roles in a sentence.
- #47,732
- “locum” frequency rank
- #7,811
- “Lou” frequency rank
- 55543
- confusion score
Side-by-Side Comparison
| Feature | locum | Lou |
|---|---|---|
| Definition | Ellipsis of locum tenens. | A unisex given name. |
Where the eye mixes locum and Lou
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence. locum runs 5 letters (CVCVC) against Lou's 3 (CVV) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses locum with Lou
These two trip readers on the page rather than in the ear: locum is /ˈləʊkəm/ while Lou is /luː/. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 letter(s) in length, and the parts of speech differ too (noun vs name), which is usually the fastest check. Our composite confusion score for this pair is 55543, 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/. Lou is at rank #7,811, tagged as aname, pronounced /luː/.
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 55543, this pair ranks #132,835 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of locum vs Lou
Shared letters: lou. Private to "locum": cm. Private to "Lou": -.
"locum" · 5 letters · shape CVCVC · "Lou" · 3 letters · shape CVV
Known mistypes of this pair
- locum ← lcoum · llocum · loccum · locmu · locumm · loucm · olcum
Frequently Asked Questions
Is swapping "locum" for "Lou" ever safe?
In ordinary English text, does "locum" or "Lou" show up more?
Useful next steps
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 "Lou" - compare definitions side by side with the headword page. Word entry
- This pair ranks #132,835 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "locum" and "Lou" also get mixed up with nearby pairs, the highest-scored neighbour is "lockup vs locum". 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 #132,835 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.