likely vs probably

likely is an adjective but probably is not an adjective.

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

As adverbs, likely and probably are synonyms defined as:

Other synonyms of likely include belike, in all likelihood, in all probability.

likely (adjective)	probably (adjective)
has a good chance of being the case or of coming about
within the realm of credibility
expected to become or be; in prospect

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