guessing vs guess

guessing and guess both are nouns.

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

As nouns, guessing and guess are synonyms defined as:

Other synonyms of guessing include dead reckoning, guesswork, shot.

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

guessing (verb)	guess (verb)
	expect, believe, or suppose
	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