veterinarian vs physician

veterinarian and physician both are nouns.

Word	Noun	Adjective	Verb	Adverb
veterinarian	Yes	No	No	No
physician	Yes	No	No	No

As nouns, physician is a hypernym of veterinarian; that is, physician is a word with a broader meaning than veterinarian:

Other hypernyms of veterinarian include doc, doctor, Dr., MD, medico.

veterinarian (noun)	physician (noun)
a doctor who practices veterinary medicine	a licensed medical practitioner