auction sale vs underbid

auction sale is a noun but underbid is not a noun.

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

auction sale (noun)	underbid (noun)
the public sale of something to the highest bidder

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