fiber-optic vs fibre-optic

fiber-optic and fibre-optic both are adjectives.

Word	Noun	Adjective	Verb	Adverb
fiber-optic	No	Yes	No	No
fibre-optic	No	Yes	No	No

As adjectives, fiber-optic and fibre-optic are synonyms defined as:

Other synonyms of fiber-optic include fiberoptic, fibreoptic.

fiber-optic (adjective)	fibre-optic (adjective)
of or relating to fiber optics	of or relating to fiber optics