motor nerve fiber vs nerve cell

motor nerve fiber and nerve cell both are nouns.

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

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

motor nerve fiber: a neuron conducting impulses outwards from the brain or spinal cord
nerve cell: a cell that is specialized to conduct nerve impulses

Other hypernyms of motor nerve fiber include neuron.

motor nerve fiber (noun)	nerve cell (noun)
a neuron conducting impulses outwards from the brain or spinal cord	a cell that is specialized to conduct nerve impulses