Once
Once adverb - At an earlier or previous time.
Previously
Mutual synonyms
Both words in one sentence
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AJ would previously snap and attack people when they called her "crazy" (which Kaitlyn had done once before by accident).
Source: Wrestling / Kaitlyn - In Naruto Suigetsu once implied that Karin (who has an unhealthy obsession with Sasuke) had previously did... "something" to Sasuke before.
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Berserk Golden Age Arc serves as one for Griffith/Femto, who was previously seen once, right before the arc started.
Source: Start of Darkness
Cite this Source
Previously and Once. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/once/previously
Once & Previously. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/once/previously>.
Previously or Once. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/once/previously.
Google Ngram Viewer shows how "once" and "previously" have occurred on timeline