glass fiber vs optical fibre

glass fiber and optical fibre both are nouns.

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

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

glass fiber and optical 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 glass fibre, optical fiber.

glass fiber (noun)	optical 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