swop vs horse trading

swop and horse trading both are nouns.

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

As nouns, horse trading is a hyponym of swop; that is, horse trading is a word with a more specific, narrower meaning than swop:

Other hyponyms of swop include horse trade.

swop (noun)	horse trading (noun)
an equal exchange	the swapping of horses (accompanied by much bargaining)
	negotiation accompanied by mutual concessions and shrewd bargaining

swop (verb)	horse trading (verb)
exchange or give (something) in exchange for