vocal vs instrumental

vocal is a noun but instrumental is not a noun.

Word	Noun	Adjective	Verb	Adverb
vocal	Yes	Yes	No	No
instrumental	No	Yes	No	No

vocal (noun)	instrumental (noun)
music intended to be performed by one or more singers, usually with instrumental accompaniment
a short musical composition with words

vocal (adjective)	instrumental (adjective)
having or using the power to produce speech or sound	relating to or designed for or performed on musical instruments
relating to or designed for or using the singing voice	serving or acting as a means or aid
given to expressing yourself freely or insistently
full of the sound of voices