surmise vs guess

surmise and guess both are nouns.

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

As nouns, surmise and guess are synonyms defined as:

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

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

As verbs, guess is a hypernym of surmise; that is, guess is a word with a broader meaning than surmise:

Other hypernyms of surmise include hazard, pretend, venture.

surmise (noun)	guess (noun)
a message expressing an opinion based on incomplete evidence	an estimate based on little or no information
	a message expressing an opinion based on incomplete evidence

surmise (verb)	guess (verb)
infer from incomplete evidence	expect, believe, or suppose
imagine to be the case or true or probable	judge tentatively or form an estimate of (quantities or time)
	guess correctly; solve by guessing
	put forward, of a guess, in spite of possible refutation