salutatory vs oratory

salutatory and oratory both are nouns.

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

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

salutatory: 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 (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)