dictation vs bidding

dictation and bidding both are nouns.

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

As nouns, dictation and bidding are synonyms defined as:

dictation and bidding: an authoritative direction or instruction to do something

Other synonyms of dictation include bid, command.

dictation (noun)	bidding (noun)
speech intended for reproduction in writing	a request to be present
an authoritative direction or instruction to do something	(bridge) the number of tricks a bridge player is willing to contract to make
matter that has been dictated and transcribed; a dictated passage	an authoritative direction or instruction to do something