supposition vs surmise

supposition and surmise both are nouns.

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

As nouns, supposition and surmise are synonyms defined as:

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

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

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

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