Which to use
“toxic” is an adjective and “toxin” is a noun - they look or sound alike but fill different roles in a sentence.
- #4,807
- “toxic” frequency rank
- #19,722
- “toxin” frequency rank
- 24529
- confusion score
Side-by-Side Comparison
| Feature | toxic | toxin |
|---|---|---|
| Definition | Having a chemical nature that is harmful to health or lethal if consumed or otherwise entering into the body in sufficient quantities. | A toxic substance, specifically a poison produced by the biological processes of organisms. |
Where the eye mixes toxic and toxin
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. toxic and toxin follow the identical consonant-vowel pattern (CVCVC). Same shape at a glance is often the real trap, independent of shared letters.
Visual trap between toxic and toxin
These two trip readers on the page rather than in the ear: toxic is /ˈtɒk.sɪk/ while toxin is /ˈtɒksɪn/. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - c in “toxic” becomes n in “toxin”, and the parts of speech differ too (adjective vs noun), which is usually the fastest check. Our composite confusion score for this pair is 24529, derived from the frequency rank of both members and their visual similarity.
toxic is recorded at frequency rank #4,807, classified as anadj, pronounced /ˈtɒk.sɪk/. toxin is at rank #19,722, tagged as anoun, pronounced /ˈtɒksɪn/.
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 24529, this pair ranks #401,278 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of toxic vs toxin
Shared letters: iotx. Private to "toxic": c. Private to "toxin": n.
"toxic" · 5 letters · shape CVCVC · "toxin" · 5 letters · shape CVCVC
Known mistypes of this pair
Frequently Asked Questions
Do "toxic" and "toxin" mean the same thing in a sentence?
Which is more common, "toxic" or "toxin"?
Useful next steps
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "toxic" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "toxin" - compare definitions side by side with the headword page. Word entry
- This pair ranks #401,278 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "toxic" and "toxin" also get mixed up with nearby pairs, the highest-scored neighbour is "Tonkin vs toxin". 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 #401,278 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.