bargaining vs dialogue

bargaining and dialogue both are nouns.

Word	Noun	Adjective	Verb	Adverb
bargaining	Yes	No	No	No
dialogue	Yes	No	No	No

As nouns, dialogue is a hypernym of bargaining; that is, dialogue is a word with a broader meaning than bargaining:

Other hypernyms of bargaining include negotiation, talks.

bargaining (noun)	dialogue (noun)
the negotiation of the terms of a transaction or agreement	the lines spoken by characters in drama or fiction
	a conversation between two persons
	a literary composition in the form of a conversation between two people
	a discussion intended to produce an agreement