auction vs underbid

auction is a noun but underbid is not a noun.

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

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a variety of bridge in which tricks made in excess of the contract are scored toward game; now generally superseded by contract bridge

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