form of address vs appellation

form of address and appellation both are nouns.

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

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

form of address: an identifying appellation signifying status or function: e.g. `Mr.' or `General'
appellation: identifying word or words by which someone or something is called and classified or distinguished from others

Other hypernyms of form of address include appellative, denomination, designation.

form of address (noun)	appellation (noun)
an identifying appellation signifying status or function: e.g. `Mr.' or `General'	identifying word or words by which someone or something is called and classified or distinguished from others
	a geographical indication used to identify where the grapes for a wine are grown