bidding vs speech act

bidding and speech act both are nouns.

Word	Noun	Adjective	Verb	Adverb
bidding	Yes	No	No	No
speech act	Yes	No	No	No

As nouns, speech act is a hypernym of bidding; that is, speech act is a word with a broader meaning than bidding:

bidding (noun)	speech act (noun)
a request to be present	the use of language to perform some act
(bridge) the number of tricks a bridge player is willing to contract to make
an authoritative direction or instruction to do something