ERSTWHILE /ˈɜː(ɹ)st.waɪl/ ► audio Scrabble 15 Words With Friends 15 Definition adverb at a previous time. — synonyms: once, formerly, at_one_time, erst adjective belonging to some prior time. — synonyms: erstwhile(a), former(a), old, onetime(a), one-time(a), quondam(a), sometime(a) See all 333 words you can make from ERSTWHILE → 9-letter words Words starting with E Words ending with E ← Unscramble different letters