dialogue vs negotiation

dialogue and negotiation both are nouns.

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

As nouns, dialogue and negotiation are synonyms defined as:

Other synonyms of dialogue include talks.

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