perhaps vs possibly

perhaps and possibly both are adverbs.

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

As adverbs, perhaps and possibly are synonyms defined as:

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

perhaps (adverb)	possibly (adverb)
by chance	by chance
	to a degree possible of achievement or by possible means