Which to use
“virus” and “viruses” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #3,537
- “virus” frequency rank
- #10,794
- “viruses” frequency rank
- 14331
- confusion score
Side-by-Side Comparison
| Feature | virus | viruses |
|---|---|---|
| Definition | A submicroscopic, non-cellular structure that consists of a core of DNA or RNA surrounded by a protein coat, that requires a living host cell to replicate, and that sometimes causes disease in the host organism (such agents are often classed as nonliving infectious particles and less often as microorganisms). | plural of virus |
Where the eye mixes virus and viruses
Muted = shared; highlighted = the visual trap. They share 5 letters in sequence. virus runs 5 letters (CVCVC) against viruses's 7 (CVCVCVC) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses virus with viruses
A purely visual mix-up. virus (/ˈvaɪ.ɹəs/) and viruses (/ˈvaɪ.ɹə.sɪz/) 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 2 extra letter(s) - “virus” sits inside “viruses”. Our composite confusion score for this pair is 14331, derived from the frequency rank of both members and their visual similarity.
virus is recorded at frequency rank #3,537, classified as anoun, pronounced /ˈvaɪ.ɹəs/. viruses is at rank #10,794, tagged as anoun, pronounced /ˈvaɪ.ɹə.sɪz/.
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 14331, this pair ranks #470,688 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of virus vs viruses
Shared letters: irsuv. Private to "virus": -. Private to "viruses": e.
"virus" · 5 letters · shape CVCVC · "viruses" · 7 letters · shape CVCVCVC
Known mistypes of this pair
Frequently Asked Questions
Can "virus" and "viruses" be used interchangeably?
Frequency check: "virus" vs "viruses" - which ranks higher?
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 "virus" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "viruses" - compare definitions side by side with the headword page. Word entry
- This pair ranks #470,688 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "virus" and "viruses" also get mixed up with nearby pairs, the highest-scored neighbour is "Vikas vs virus". 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 #470,688 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.