horse trade vs horse trading

horse trade and horse trading both are nouns.

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

As nouns, horse trade and horse trading are synonyms defined as:

horse trade and horse trading: the swapping of horses (accompanied by much bargaining)

horse trade (noun)	horse trading (noun)
the swapping of horses (accompanied by much bargaining)	the swapping of horses (accompanied by much bargaining)
	negotiation accompanied by mutual concessions and shrewd bargaining