form of address vs Dona

form of address and Dona both are nouns.

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

As nouns, Dona is a hyponym of form of address; that is, Dona is a word with a more specific, narrower meaning than form of address:

form of address: an identifying appellation signifying status or function: e.g. `Mr.' or `General'
Dona: a Spanish courtesy title or form of address for a woman

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