Aga vs form of address

Aga and form of address both are nouns.

Word	Noun	Adjective	Verb	Adverb
Aga	Yes	No	No	No
form of address	Yes	No	No	No

As nouns, form of address is a hypernym of Aga; that is, form of address is a word with a broader meaning than Aga:

Aga: title for a civil or military leader (especially in Turkey)
form of address: an identifying appellation signifying status or function: e.g. `Mr.' or `General'

Other hypernyms of Aga include title, title of respect.

Aga (noun)	form of address (noun)
title for a civil or military leader (especially in Turkey)	an identifying appellation signifying status or function: e.g. `Mr.' or `General'