poler vs pole horse

poler and pole horse both are nouns.

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

As nouns, poler and pole horse are synonyms defined as:

poler and pole horse: a draft horse harnessed alongside the shaft or pole of a vehicle

poler (noun)	pole horse (noun)
a draft horse harnessed alongside the shaft or pole of a vehicle	a draft horse harnessed alongside the shaft or pole of a vehicle
	the horse having a starting position next to the inside rail in a harness race