Which to use
“nuclear” is an adjective and “nucleus” is a noun - they look or sound alike but fill different roles in a sentence.
- #1,911
- “nuclear” frequency rank
- #13,203
- “nucleus” frequency rank
- 15114
- confusion score
Side-by-Side Comparison
| Feature | nuclear | nucleus |
|---|---|---|
| Definition | Pertaining to the nucleus of an atom. | The core, central part of something, around which other elements are assembled. |
Where the eye mixes nuclear and nucleus
Muted = shared; highlighted = the visual trap. They share 5 letters in sequence. nuclear and nucleus follow the identical consonant-vowel pattern (CVCCVVC). Same shape at a glance is often the real trap, independent of shared letters.
Why the eye confuses nuclear with nucleus
These two trip readers on the page rather than in the ear: nuclear is /ˈn(j)u.kli.ɚ/ while nucleus is /ˈnjuː.kli.əs/. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 15114, derived from the frequency rank of both members and their visual similarity.
nuclear is recorded at frequency rank #1,911, classified as anadj, pronounced /ˈn(j)u.kli.ɚ/. 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 15114, this pair ranks #465,969 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of nuclear vs nucleus
Shared letters: celnu. Private to "nuclear": ar. Private to "nucleus": s.
"nuclear" · 7 letters · shape CVCCVVC · "nucleus" · 7 letters · shape CVCCVVC
Known mistypes of this pair
Frequently Asked Questions
Do "nuclear" and "nucleus" mean the same thing in a sentence?
Which is more common, "nuclear" or "nucleus"?
Useful next steps
Eye-level mix-up between "nuclear" and "nucleus" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "nuclear" 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 #465,969 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "nuclear" and "nucleus" also get mixed up with nearby pairs, the highest-scored neighbour is "nucleic vs nucleus". 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 #465,969 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.