gynecology vs medical specialty

gynecology and medical specialty both are nouns.

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

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

gynecology: the branch of medicine that deals with the diseases and hygiene of women
medical specialty: the branches of medical science that deal with nonsurgical techniques

Other hypernyms of gynecology include medicine.

gynecology (noun)	medical specialty (noun)
the branch of medicine that deals with the diseases and hygiene of women	the branches of medical science that deal with nonsurgical techniques