centripetal vs afferent

centripetal is not a noun while afferent is a noun.

Word	Noun	Adjective	Verb	Adverb
centripetal	No	Yes	No	No
afferent	Yes	Yes	No	No

centripetal (noun)	afferent (noun)
	a nerve that passes impulses from receptors toward or to the central nervous system

centripetal (adjective)	afferent (adjective)
tending to move toward a center	of nerves and nerve impulses; conveying sensory information from the sense organs to the CNS
of a nerve fiber or impulse originating outside and passing toward the central nervous system
tending to unify