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once vs erstwhile

erstwhile vs once

once is not an adjective while erstwhile is an adjective.

once and erstwhile both are adverbs.

Word NounAdjectiveVerbAdverb
once No No No Yes
erstwhile No Yes No Yes
As adverbs, once and erstwhile are synonyms defined as:
  • once and erstwhile: at a previous time
Other synonyms of once include at one time, erst, formerly.
once (adjective) erstwhile (adjective)
belonging to some prior time
once (adverb) erstwhile (adverb)
on one occasion at a previous time
at a previous time
as soon as
Difference between once and erstwhile

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