afferent fiber vs afferent nerve

afferent fiber and afferent nerve both are nouns.

Word	Noun	Adjective	Verb	Adverb
afferent fiber	Yes	No	No	No
afferent nerve	Yes	No	No	No

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