auction vs overbid

auction and overbid both are nouns.

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

auction (noun)	overbid (noun)
the public sale of something to the highest bidder	a bid that is higher than preceding bids
a variety of bridge in which tricks made in excess of the contract are scored toward game; now generally superseded by contract bridge	(bridge) a bid that is higher than your opponent's bid (especially when your partner has not bid at all and your bid exceeds the value of your hand)

auction (verb)	overbid (verb)
sell at an auction	bid more than the object is worth
	to bid for more tricks than one can expect to win