Nouns

(n)peradventuredoubt or uncertainty as to whether something is the case“this proves beyond peradventure that he is innocent”

Adverbs

(r)possibly, perchance, perhaps, maybe, mayhap, peradventureby chance“perhaps she will call tomorrow”, “we may possibly run into them at the concert”, “it may peradventure be thought that there never was such a time”