Once
Once adjective - Having been such at some previous time.
Whenever
Both words in one sentence
- As noted in Darrel Huff's famous book, How to Lie with Statistics, a bunch of islanders once noticed that whenever they were sick, they didn't have lice, whereas whenever they were healthy, they did.
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And having done it once, he can do it whenever he wants - For the rest of the series, he thus has access to an ability that usually qualifies one as an Auror.
Source: There Is No Try -
UFO. SID (Space Intruder Detector), SHADO Control and Moonbase all call them whenever a UFO is detected, so it happens on an average of once per episode.
Source: Red Alert
Cite this Source
Whenever and Once. (2016). Retrieved 2026, July 28, from https://thesaurus.plus/related/once/whenever
Once & Whenever. N.p., 2016. Web. 28 Jul. 2026. <https://thesaurus.plus/related/once/whenever>.
Whenever or Once. 2016. Accessed July 28, 2026. https://thesaurus.plus/related/once/whenever.
Google Ngram Viewer shows how "once" and "whenever" have occurred on timeline