vet vs horse doctor

vet and horse doctor both are nouns.

Word	Noun	Adjective	Verb	Adverb
vet	Yes	No	Yes	No
horse doctor	Yes	No	No	No

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

vet (noun)	horse doctor (noun)
a doctor who practices veterinary medicine	a veterinarian who treats horses
a person who has served in the armed forces

vet (verb)	horse doctor (verb)
provide veterinary care for
provide (a person) with medical care
examine carefully
work as a veterinarian