unacknowledged vs unsung

unacknowledged and unsung both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unacknowledged	No	Yes	No	No
unsung	No	Yes	No	No

unacknowledged (adjective)	unsung (adjective)
not recognized or admitted	not famous or acclaimed
not openly acknowledged	having value that is not acknowledged