infer vs guess

infer is not a noun while guess is a noun.

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

As verbs, infer and guess are synonyms defined as:

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

infer (verb)	guess (verb)
reason by deduction; establish by deduction	expect, believe, or suppose
believe to be the case	judge tentatively or form an estimate of (quantities or time)
guess correctly; solve by guessing	guess correctly; solve by guessing
conclude by reasoning; in logic	put forward, of a guess, in spite of possible refutation
draw from specific cases for more general cases