trotter vs pole horse

trotter and pole horse both are nouns.

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

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

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

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