lowball vs estimate

lowball is not a noun while estimate is a noun.

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

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

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

lowball (noun)	estimate (noun)
	a judgment of the qualities of something or somebody
	an approximate calculation of quantity or degree or worth
	the respect with which a person is held
	a document appraising the value of something (as for insurance or taxation)
	a statement indicating the likely cost of some job

lowball (verb)	estimate (verb)
make a deliberately low estimate	judge tentatively or form an estimate of (quantities or time)
	judge to be probable