bid vs preempt

bid and preempt both are nouns.

Word	Noun	Adjective	Verb	Adverb
bid	Yes	No	Yes	No
preempt	Yes	No	Yes	No

As nouns, preempt is a hyponym of bid; that is, preempt is a word with a more specific, narrower meaning than bid:

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

Other hyponyms of bid include contract, declaration, takeout, overbid, overcall, pre-empt, preemptive bid.

As verbs, preempt is a hyponym of bid; that is, preempt is a word with a more specific, narrower meaning than bid:

Other hyponyms of bid include raise, double, outcall, underbid, outbid, overbid.

bid (noun)	preempt (noun)
an attempt to get something	a high bid that is intended to prevent the opposing players from bidding
a formal proposal to buy at a specified price
(bridge) the number of tricks a bridge player is willing to contract to make
an authoritative direction or instruction to do something

bid (verb)	preempt (verb)
ask someone in a friendly way to do something	acquire for oneself before others can do so
invoke upon	make a preemptive bid in the game of bridge
ask for or request earnestly	gain possession of by prior right or opportunity, especially so as to obtain the right to buy (land)
propose a payment	take the place of or have precedence over
make a demand, as for a card or a suit or a show of hands
make a serious effort to attain something