optical fiber vs optical fibre

optical fiber and optical fibre both are nouns.

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

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

optical 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 optical fiber include glass fiber, glass fibre.

optical 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