invitation vs bidding

invitation and bidding both are nouns.

Word	Noun	Adjective	Verb	Adverb
invitation	Yes	No	No	No
bidding	Yes	No	No	No

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

invitation: a request (spoken or written) to participate or be present or take part in something
bidding: a request to be present

Other hyponyms of invitation include summons, invite.

invitation (noun)	bidding (noun)
a tempting allurement	a request to be present
a request (spoken or written) to participate or be present or take part in something	(bridge) the number of tricks a bridge player is willing to contract to make
	an authoritative direction or instruction to do something