hi-fi vs accurate

hi-fi is a noun but accurate is not a noun.

Word	Noun	Adjective	Verb	Adverb
hi-fi	Yes	Yes	No	No
accurate	No	Yes	No	No

hi-fi (noun)	accurate (noun)
the reproduction of sound with little or no distortion
equipment for the reproduction of sound with high fidelity

hi-fi (adjective)	accurate (adjective)
characterized by minimal distortion in sound reproduction	conforming exactly or almost exactly to fact or to a standard or performing with total accuracy
	(of ideas, images, representations, expressions) characterized by perfect conformity to fact or truth; strictly correct