fibre vs nerve fiber

fibre and nerve fiber both are nouns.

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

As nouns, nerve fiber is a hyponym of fibre; that is, nerve fiber is a word with a more specific, narrower meaning than fibre:

fibre: any of several elongated, threadlike cells (especially a muscle fiber or a nerve fiber)
nerve fiber: a threadlike extension of a nerve cell

Other hyponyms of fibre include muscle cell, muscle fiber, muscle fibre, nerve fibre.

As nouns, nerve fiber is a hyponym of fibre; that is, nerve fiber is a word with a more specific, narrower meaning than fibre:

fibre: a slender and greatly elongated substance capable of being spun into yarn
nerve fiber: a threadlike extension of a nerve cell

fibre (noun)	nerve fiber (noun)
a leatherlike material made by compressing layers of paper or cloth	a threadlike extension of a nerve cell
the inherent complex of attributes that determines a persons moral and ethical actions and reactions
any of several elongated, threadlike cells (especially a muscle fiber or a nerve fiber)
coarse, indigestible plant food low in nutrients; its bulk stimulates intestinal peristalsis
a slender and greatly elongated substance capable of being spun into yarn