optical fiber vs glass fiber

optical fiber and glass fiber both are nouns.

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

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

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

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

optical fiber (noun)	glass 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