motor fiber vs nerve fiber

motor fiber and nerve fiber both are nouns.

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

As nouns, nerve fiber is a hypernym of motor fiber; that is, nerve fiber is a word with a broader meaning than motor fiber:

motor fiber: a nerve fiber that carries impulses toward the muscles or glands
nerve fiber: a threadlike extension of a nerve cell

Other hypernyms of motor fiber include nerve fibre.

motor fiber (noun)	nerve fiber (noun)
a nerve fiber that carries impulses toward the muscles or glands	a threadlike extension of a nerve cell