Which to use
“locus” and “lupus” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #23,026
- “locus” frequency rank
- #22,427
- “lupus” frequency rank
- 45453
- confusion score
Side-by-Side Comparison
| Feature | locus | lupus |
|---|---|---|
| Definition | A place or locality, especially a centre of activity or the scene of a crime. | Any of a number of autoimmune diseases, the most common of which is systemic lupus erythematosus. |
Where the eye mixes locus and lupus
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence. locus and lupus follow the identical consonant-vowel pattern (CVCVC). Same shape at a glance is often the real trap, independent of shared letters.
Visual trap between locus and lupus
A purely visual mix-up. locus (/ˈləʊkəs/) and lupus (/ˈluːpəs/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 45453, derived from the frequency rank of both members and their visual similarity.
locus is recorded at frequency rank #23,026, classified as anoun, pronounced /ˈləʊkəs/. lupus is at rank #22,427, tagged as anoun, pronounced /ˈluːpəs/.
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 45453, this pair ranks #221,144 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of locus vs lupus
Shared letters: lsu. Private to "locus": co. Private to "lupus": p.
"locus" · 5 letters · shape CVCVC · "lupus" · 5 letters · shape CVCVC
Known mistypes of this pair
Frequently Asked Questions
Is swapping "locus" for "lupus" ever safe?
In ordinary English text, does "locus" or "lupus" show up more?
Useful next steps
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "locus" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "lupus" - compare definitions side by side with the headword page. Word entry
- This pair ranks #221,144 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "locus" and "lupus" also get mixed up with nearby pairs, the highest-scored neighbour is "lockup vs locus". 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 #221,144 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.