Signora vs form of address

Signora and form of address both are nouns.

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

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

Signora: an Italian title or form of address for a married woman
form of address: an identifying appellation signifying status or function: e.g. `Mr.' or `General'

Other hypernyms of Signora include title, title of respect.

Signora (noun)	form of address (noun)
an Italian title or form of address for a married woman	an identifying appellation signifying status or function: e.g. `Mr.' or `General'