perhaps vs peradventure

perhaps is not a noun while peradventure is a noun.

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

As adverbs, perhaps and peradventure are synonyms defined as:

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

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

perhaps (adverb)	peradventure (adverb)
by chance	by chance