angiology vs medical specialty

angiology and medical specialty both are nouns.

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

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

angiology: the branch of medical science that studies the blood and lymph vessels and their disorders
medical specialty: the branches of medical science that deal with nonsurgical techniques

Other hypernyms of angiology include medicine.

angiology (noun)	medical specialty (noun)
the branch of medical science that studies the blood and lymph vessels and their disorders	the branches of medical science that deal with nonsurgical techniques