pole horse vs trotter

pole horse and trotter both are nouns.

Word	Noun	Adjective	Verb	Adverb
pole horse	Yes	No	No	No
trotter	Yes	No	No	No

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

pole horse: the horse having a starting position next to the inside rail in a harness race
trotter: a horse trained to trot; especially a horse trained for harness racing

Other hypernyms of pole horse include trotting horse.

pole horse (noun)	trotter (noun)
a draft horse harnessed alongside the shaft or pole of a vehicle	a horse trained to trot; especially a horse trained for harness racing
the horse having a starting position next to the inside rail in a harness race	foot of a pig or sheep especially one used as food