warnvswhenWhat's the difference?

Quick tell: warn is a verb, when is an adverb, so they fill different roles in a sentence.

Which to use

“warn” is a verb and “when” is an adverb - they look or sound alike but fill different roles in a sentence.

#6,976
“warn” frequency rank
#48
“when” frequency rank
7024
confusion score

Side-by-Side Comparison

Feature warn when
Definition To make (someone) aware of (something impending); especially: At what time? At which time? Upon which occasion or circumstance? Used to introduce direct or indirect questions about time.

Where the eye mixes warn and when

Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.

4 ch
warn
4 ch
when

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: warn is /wɔːn/ while when is /ˈwɛn/. 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 (verb vs adverb), which is usually the fastest check. Our composite confusion score for this pair is 7024, derived from the frequency rank of both members and their visual similarity.

warn is recorded at frequency rank #6,976, classified as averb, pronounced /wɔːn/. when is at rank #48, tagged as anadv, pronounced /ˈwɛn/.

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 7024, this pair ranks #508,905 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of warn vs when

Shared letters: nw. Private to "warn": ar. Private to "when": eh.

"warn" · 4 letters · shape CVCC  ·  "when" · 4 letters · shape CCVC

Known mistypes of this pair

  • warnawrn · wanr · warnn · warrn · wran · wwarn
  • whenhwen · wehn · whenn · whhen · whne · wwhen

Frequently Asked Questions

Can "warn" and "when" be used interchangeably?
No - they are not even the same part of speech. "warn" is a verb and "when" an adverb, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "warn" or "when"?
"when" is the more common of the two: it sits at frequency rank #48 in our English list, against #6,976 for "warn". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list