Back
Back adverb - Earlier than the present time.
Once
Once adverb - At an earlier or previous time.
Back and once are semantically related in in the past topic. Sometimes you can use "Back" instead an adverb "Once".
Both words in one sentence
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In both his battles with the Hulk he barely fights back and in the first literally lays there as the Hulk SLOWLY pounds on him before trying to fight back and once again starts running into the Hulk's fists forgetting the basics of fighting.
Source: Western Animation / Hulk Vs. -
Following him is Wario, who was dead (or rather, assimilated) in the previous episode, yet he came back and once again said he was glad everyone remembered the birthday that was being celebrated.
- He was shot twice in the back and once in the head.
Source: Made Of Iron / Real Life
Cite this Source
Once and Back. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/back/once
Back & Once. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/back/once>.
Once or Back. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/back/once.
Google Ngram Viewer shows how "back" and "once" have occurred on timeline