Which to use
“optional” is an adjective and “optionally” is an adverb - they look or sound alike but fill different roles in a sentence.
- #8,180
- “optional” frequency rank
- #38,081
- “optionally” frequency rank
- 46261
- confusion score
Side-by-Side Comparison
| Feature | optional | optionally |
|---|---|---|
| Definition | Not compulsory; left to personal choice; elective. | In an optional manner; not mandatorily. |
Where the eye mixes optional and optionally
Muted = shared; highlighted = the visual trap. They share 8 letters in sequence.
Why the eye confuses optional with optionally
These two trip readers on the page rather than in the ear: optional is /ˈɒp.ʃə.nəl/ while optionally is /ˈɑpʃənəli/. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 extra letter(s) - “optional” sits inside “optionally”, and the parts of speech differ too (adjective vs adverb), which is usually the fastest check. Our composite confusion score for this pair is 46261, derived from the frequency rank of both members and their visual similarity.
optional is recorded at frequency rank #8,180, classified as anadj, pronounced /ˈɒp.ʃə.nəl/. optionally is at rank #38,081, tagged as anadv, pronounced /ˈɑpʃənəli/.
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 46261, this pair ranks #213,446 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of optional vs optionally
Shared letters: ailnopt. Private to "optional": -. Private to "optionally": y.
"optional" · 8 letters · shape VCCVVCVC · "optionally" · 10 letters · shape VCCVVCVCCV
Known mistypes of this pair
- optional ← opitonal · opptional · optinoal · optioanl · optionall · optionla · optionnal · optoinal
- optionally ← opitonally · opptionally · optinoally · optioanlly · optionallyy · optionaly · optionalyl · optionlaly
Frequently Asked Questions
Is swapping "optional" for "optionally" ever safe?
Frequency check: "optional" vs "optionally" - which ranks higher?
Useful next steps
Eye-level mix-up between "optional" and "optionally" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "optional" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "optionally" - compare definitions side by side with the headword page. Word entry
- This pair ranks #213,446 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "optional" and "optionally" also get mixed up with nearby pairs, the highest-scored neighbour is "optically vs optionally". 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 #213,446 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.