last hurrah vs swan song

last hurrah and swan song both are nouns.

Word	Noun	Adjective	Verb	Adverb
last hurrah	Yes	No	No	No
swan song	Yes	No	No	No

As nouns, last hurrah and swan song are synonyms defined as:

last hurrah and swan song: a final performance or effort (especially before retirement)

last hurrah (noun)	swan song (noun)
a final performance or effort (especially before retirement)	a final performance or effort (especially before retirement)