geriatrics vs medical specialty

geriatrics and medical specialty both are nouns.

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

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

geriatrics: the branch of medical science that deals with diseases and problems specific to old people
medical specialty: the branches of medical science that deal with nonsurgical techniques

Other hypernyms of geriatrics include medicine.

geriatrics (noun)	medical specialty (noun)
the branch of medical science that deals with diseases and problems specific to old people	the branches of medical science that deal with nonsurgical techniques