staple fiber vs staple fibre

staple fiber and staple fibre both are nouns.

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

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

staple fiber and staple fibre: a natural fiber (raw cotton, wool, hemp, flax) that can be twisted to form yarn

Other synonyms of staple fiber include staple.

staple fiber (noun)	staple fibre (noun)
a natural fiber (raw cotton, wool, hemp, flax) that can be twisted to form yarn	a natural fiber (raw cotton, wool, hemp, flax) that can be twisted to form yarn