Which to use
“nuclei” and “nucleus” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #22,751
- “nuclei” frequency rank
- #13,203
- “nucleus” frequency rank
- 35954
- confusion score
Side-by-Side Comparison
| Feature | nuclei | nucleus |
|---|---|---|
| Definition | plural of nucleus | The core, central part of something, around which other elements are assembled. |
Where the eye mixes nuclei and nucleus
Muted = shared; highlighted = the visual trap. They share 5 letters in sequence. nuclei runs 6 letters (CVCCVV) against nucleus's 7 (CVCCVVC) - the length gap alone is often enough to separate them once you know to check it.
Visual trap between nuclei and nucleus
A purely visual mix-up. nuclei (/ˈnjuː.kli.aɪ/) and nucleus (/ˈnjuː.kli.əs/) 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 35954, derived from the frequency rank of both members and their visual similarity.
nuclei is recorded at frequency rank #22,751, classified as anoun, pronounced /ˈnjuː.kli.aɪ/. nucleus is at rank #13,203, tagged as anoun, pronounced /ˈnjuː.kli.əs/.
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 35954, this pair ranks #307,472 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of nuclei vs nucleus
Shared letters: celnu. Private to "nuclei": i. Private to "nucleus": s.
"nuclei" · 6 letters · shape CVCCVV · "nucleus" · 7 letters · shape CVCCVVC
Known mistypes of this pair
Frequently Asked Questions
Do "nuclei" and "nucleus" mean the same thing in a sentence?
Frequency check: "nuclei" vs "nucleus" - which ranks higher?
What to do next
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "nuclei" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "nucleus" - compare definitions side by side with the headword page. Word entry
- This pair ranks #307,472 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "nuclei" and "nucleus" also get mixed up with nearby pairs, the highest-scored neighbour is "nuclei vs nucleic". 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 #307,472 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.