surmise vs supposition

surmise and supposition both are nouns.

Word	Noun	Adjective	Verb	Adverb
surmise	Yes	No	Yes	No
supposition	Yes	No	No	No

As nouns, surmise and supposition are synonyms defined as:

surmise and supposition: a message expressing an opinion based on incomplete evidence

Other synonyms of surmise include conjecture, guess, hypothesis, speculation, surmisal.

surmise (noun)	supposition (noun)
a message expressing an opinion based on incomplete evidence	a hypothesis that is taken for granted
	the cognitive process of supposing
	a message expressing an opinion based on incomplete evidence

surmise (verb)	supposition (verb)
infer from incomplete evidence
imagine to be the case or true or probable