Mr vs form of address

Mr and form of address both are nouns.

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

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

Mr: a form of address for a man
form of address: an identifying appellation signifying status or function: e.g. `Mr.' or `General'

Other hypernyms of Mr include title, title of respect.

Mr (noun)	form of address (noun)
a form of address for a man	an identifying appellation signifying status or function: e.g. `Mr.' or `General'