glass fiber vs optical fiber

glass fiber and optical fiber both are nouns.

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

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

glass fiber and optical fiber: 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 fibre.

glass fiber (noun)	optical fiber (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