Clydesdale vs dray horse

Clydesdale and dray horse both are nouns.

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

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

Clydesdale: heavy feathered-legged breed of draft horse originally from Scotland
dray horse: horse adapted for drawing heavy loads

Other hypernyms of Clydesdale include draft horse, draught horse.

Clydesdale (noun)	dray horse (noun)
heavy feathered-legged breed of draft horse originally from Scotland	horse adapted for drawing heavy loads