surmise vs venture

surmise and venture both are nouns.

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

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

Other hypernyms of surmise include guess, hazard, pretend.

surmise (noun)	venture (noun)
a message expressing an opinion based on incomplete evidence	any venturesome undertaking especially one with an uncertain outcome
	a commercial undertaking that risks a loss but promises a profit
	an investment that is very risky but could yield great profits

surmise (verb)	venture (verb)
infer from incomplete evidence	put forward, of a guess, in spite of possible refutation
imagine to be the case or true or probable	put at risk
	proceed somewhere despite the risk of possible dangers