Percheron vs dray horse

Percheron and dray horse both are nouns.

Word	Noun	Adjective	Verb	Adverb
Percheron	Yes	No	No	No
dray horse	Yes	No	No	No

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

Percheron: one of a breed of grey or black draft horses originally used in France to draw heavy coaches or artillery
dray horse: horse adapted for drawing heavy loads

Other hypernyms of Percheron include draft horse, draught horse.

Percheron (noun)	dray horse (noun)
one of a breed of grey or black draft horses originally used in France to draw heavy coaches or artillery	horse adapted for drawing heavy loads