glass fiber vs glass fibre

glass fiber and glass fibre both are nouns.

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

As nouns, glass fiber and glass fibre are synonyms defined as:

glass fiber and glass fibre: a very thin fiber made of glass that functions as a waveguide for light; used in bundles to transmit images

Other synonyms of glass fiber include optical fiber, optical fibre.

glass fiber (noun)	glass fibre (noun)
a very thin fiber made of glass that functions as a waveguide for light; used in bundles to transmit images	a very thin fiber made of glass that functions as a waveguide for light; used in bundles to transmit images