fibre vs nerve fibre

fibre and nerve fibre both are nouns.

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

As nouns, nerve fibre is a hyponym of fibre; that is, nerve fibre 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 fibre: a threadlike extension of a nerve cell

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

As nouns, nerve fibre is a hyponym of fibre; that is, nerve fibre 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 fibre: a threadlike extension of a nerve cell

fibre (noun)	nerve fibre (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