possibly vs maybe

possibly and maybe both are adverbs.

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

As adverbs, possibly and maybe are synonyms defined as:

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

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