dentistry vs medical specialty

dentistry and medical specialty both are nouns.

Word	Noun	Adjective	Verb	Adverb
dentistry	Yes	No	No	No
medical specialty	Yes	No	No	No

As nouns, medical specialty is a hypernym of dentistry; that is, medical specialty is a word with a broader meaning than dentistry:

dentistry: the branch of medicine dealing with the anatomy and development and diseases of the teeth
medical specialty: the branches of medical science that deal with nonsurgical techniques

Other hypernyms of dentistry include medicine.

dentistry (noun)	medical specialty (noun)
the branch of medicine dealing with the anatomy and development and diseases of the teeth	the branches of medical science that deal with nonsurgical techniques