valedictory address vs valediction

valedictory address and valediction both are nouns.

Word	Noun	Adjective	Verb	Adverb
valedictory address	Yes	No	No	No
valediction	Yes	No	No	No

As nouns, valedictory address and valediction are synonyms defined as:

valedictory address and valediction: a farewell oration (especially one delivered during graduation exercises by an outstanding member of a graduating class)

Other synonyms of valedictory address include valedictory, valedictory oration.

valedictory address (noun)	valediction (noun)
a farewell oration (especially one delivered during graduation exercises by an outstanding member of a graduating class)	the act of saying farewell
	a farewell oration (especially one delivered during graduation exercises by an outstanding member of a graduating class)