Which to use
“allergen” is a noun and “allergic” is an adjective - they look or sound alike but fill different roles in a sentence.
- #45,197
- “allergen” frequency rank
- #9,845
- “allergic” frequency rank
- 55042
- confusion score
Side-by-Side Comparison
| Feature | allergen | allergic |
|---|---|---|
| Definition | A substance which causes an allergic reaction. | Of or pertaining to allergy. |
Where the eye mixes allergen and allergic
Muted = shared; highlighted = the visual trap. They share 6 letters in sequence. allergen and allergic follow the identical consonant-vowel pattern (VCCVCCVC). Same shape at a glance is often the real trap, independent of shared letters.
Visual trap between allergen and allergic
These two trip readers on the page rather than in the ear: allergen is /ˈælə(ɹ)ˌd͡ʒɛn/ while allergic is /əˈlɜː.dʒɪk/. 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 (noun vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 55042, derived from the frequency rank of both members and their visual similarity.
allergen is recorded at frequency rank #45,197, classified as anoun, pronounced /ˈælə(ɹ)ˌd͡ʒɛn/. allergic is at rank #9,845, tagged as anadj, pronounced /əˈlɜː.dʒɪk/.
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 55042, this pair ranks #136,574 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of allergen vs allergic
Shared letters: aeglr. Private to "allergen": n. Private to "allergic": ci.
"allergen" · 8 letters · shape VCCVCCVC · "allergic" · 8 letters · shape VCCVCCVC
Known mistypes of this pair
Frequently Asked Questions
Can "allergen" and "allergic" be used interchangeably?
In ordinary English text, does "allergen" or "allergic" show up more?
After this comparison
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "allergen" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "allergic" - compare definitions side by side with the headword page. Word entry
- This pair ranks #136,574 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "allergen" and "allergic" also get mixed up with nearby pairs, the highest-scored neighbour is "allege vs allergen". 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 #136,574 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.