imagine vs guess

imagine is not a noun while guess is a noun.

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

As verbs, imagine and guess are synonyms defined as:

Other synonyms of imagine include opine, reckon, suppose, think.

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

imagine (verb)	guess (verb)
expect, believe, or suppose	expect, believe, or suppose
form a mental image of something that is not present or that is not the case	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