unaccompanied vs a capella

unaccompanied and a capella both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unaccompanied	No	Yes	No	Yes
a capella	No	Yes	No	Yes

unaccompanied (adjective)	a capella (adjective)
being without an escort	sung without instrumental accompaniment
playing or singing without accompaniment
(of a state or an event) taking place without something specified occurring at the same time

unaccompanied (adverb)	a capella (adverb)
without anybody else or anything else	without musical accompaniment