88 entries under adverb topic. ×

24
immediately(noun, conjunction)
20
previously(adjective, time, past, general)
20
when(conjunction, immediately, after)
16
formerly(adjective, time, late, past)
15
before(adjective, time, late, past)
12
at one time(expression, adjective, idiom, late)
12
erstwhile(adjective, time, last, original)
12
as soon as(conjunction, expression, verb, phrasal verb, noun)
12
sometime(expression, adjective, time, moment)
11
earlier(adjective, time, late, old)
11
heretofore(adjective, time, late, past)
11
long ago(expression, adjective, idiom, time)
11
already(adjective, time, late, past)
11
one time(expression, idiom, frequency)
10
late(adjective, last, original, dead)
10
sometimes(expression, time, moment, period)
9
former(noun, adjective, order, time)
9
quondam(adjective, last, original, late)
8
old(adjective, last, late, past)
7
at times(expression, idiom, time, moment)
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APASmart Define. (2016). once thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/once/thesaurus/synonyms
ChicagoSmart Define. 2016. "once thesaurus" https://smartdefine.org/once/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, once thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/once/thesaurus/synonyms>.
MLASmart Define. "once thesaurus" 30 March 2016. Web. 20 September 2026. <https://smartdefine.org/once/thesaurus/synonyms>