staple fibre vs staple fiber

staple fibre and staple fiber both are nouns.

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

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

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

Other synonyms of staple fibre include staple.

staple fibre (noun)	staple fiber (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