maybe vs possibly

maybe and possibly both are adverbs.

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

As adverbs, maybe and possibly are synonyms defined as:

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

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