in all probability vs in all likelihood

in all probability and in all likelihood both are adverbs.

Word	Noun	Adjective	Verb	Adverb
in all probability	No	No	No	Yes
in all likelihood	No	No	No	Yes

As adverbs, in all probability and in all likelihood are synonyms defined as:

in all probability and in all likelihood: with considerable certainty; without much doubt

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

in all probability (adverb)	in all likelihood (adverb)
with considerable certainty; without much doubt	with considerable certainty; without much doubt