underbid vs auction

underbid is not a noun while auction is a noun.

Word	Noun	Adjective	Verb	Adverb
underbid	No	No	Yes	No
auction	Yes	No	Yes	No

underbid (noun)	auction (noun)
	the public sale of something to the highest bidder
	a variety of bridge in which tricks made in excess of the contract are scored toward game; now generally superseded by contract bridge

underbid (verb)	auction (verb)
bid too low	sell at an auction
bid lower than a competing bidder
bid (a hand of cards) at less than the strength of the hand warrants