plausibly vs probably

plausibly and probably both are adverbs.

Word	Noun	Adjective	Verb	Adverb
plausibly	No	No	No	Yes
probably	No	No	No	Yes

As adverbs, plausibly and probably are synonyms defined as:

plausibly and probably: easy to believe on the basis of available evidence

Other synonyms of plausibly include believably, credibly.

plausibly (adverb)	probably (adverb)
easy to believe on the basis of available evidence	with considerable certainty; without much doubt
	easy to believe on the basis of available evidence