salutatory address vs oratory

salutatory address and oratory both are nouns.

Word	Noun	Adjective	Verb	Adverb
salutatory address	Yes	No	No	No
oratory	Yes	No	No	No

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

salutatory address: an opening or welcoming statement (especially one delivered at graduation exercises)
oratory: addressing an audience formally (usually a long and rhetorical address and often pompous)

salutatory address (noun)	oratory (noun)
an opening or welcoming statement (especially one delivered at graduation exercises)	addressing an audience formally (usually a long and rhetorical address and often pompous)