psychiatry vs medical specialty

psychiatry and medical specialty both are nouns.

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

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

psychiatry: the branch of medicine dealing with the diagnosis and treatment of mental disorders
medical specialty: the branches of medical science that deal with nonsurgical techniques

Other hypernyms of psychiatry include medicine.

psychiatry (noun)	medical specialty (noun)
the branch of medicine dealing with the diagnosis and treatment of mental disorders	the branches of medical science that deal with nonsurgical techniques