lowball vs guess

lowball is not a noun while guess is a noun.

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

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

Other hypernyms of lowball include approximate, estimate, gauge, judge.

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

lowball (verb)	guess (verb)
make a deliberately low estimate	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