pre-empt vs bidding

pre-empt and bidding both are nouns.

Word	Noun	Adjective	Verb	Adverb
pre-empt	Yes	No	No	No
bidding	Yes	No	No	No

As nouns, bidding is a hypernym of pre-empt; that is, bidding is a word with a broader meaning than pre-empt:

pre-empt: a high bid that is intended to prevent the opposing players from bidding
bidding: (bridge) the number of tricks a bridge player is willing to contract to make

Other hypernyms of pre-empt include bid.

pre-empt (noun)	bidding (noun)
a high bid that is intended to prevent the opposing players from bidding	a request to be present
	(bridge) the number of tricks a bridge player is willing to contract to make
	an authoritative direction or instruction to do something