peradventure vs maybe

peradventure is a noun but maybe is not a noun.

Word	Noun	Adjective	Verb	Adverb
peradventure	Yes	No	No	Yes
maybe	No	No	No	Yes

As adverbs, peradventure and maybe are synonyms defined as:

Other synonyms of peradventure include mayhap, perchance, perhaps, possibly.

peradventure (noun)	maybe (noun)
doubt or uncertainty as to whether something is the case

peradventure (adverb)	maybe (adverb)
by chance	by chance