optical fibre vs optical fiber

optical fibre and optical fiber both are nouns.

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

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

optical fibre 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 optical fibre include glass fiber, glass fibre.

optical fibre (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