horse trading vs negotiation

horse trading and negotiation both are nouns.

Word	Noun	Adjective	Verb	Adverb
horse trading	Yes	No	No	No
negotiation	Yes	No	No	No

As nouns, negotiation is a hypernym of horse trading; that is, negotiation is a word with a broader meaning than horse trading:

horse trading: negotiation accompanied by mutual concessions and shrewd bargaining
negotiation: a discussion intended to produce an agreement

Other hypernyms of horse trading include dialogue, talks.

horse trading (noun)	negotiation (noun)
the swapping of horses (accompanied by much bargaining)	the activity or business of negotiating an agreement; coming to terms
negotiation accompanied by mutual concessions and shrewd bargaining	a discussion intended to produce an agreement