plant fibre vs hemp

plant fibre and hemp both are nouns.

Word	Noun	Adjective	Verb	Adverb
plant fibre	Yes	No	No	No
hemp	Yes	No	No	No

As nouns, hemp is a hyponym of plant fibre; that is, hemp is a word with a more specific, narrower meaning than plant fibre:

plant fibre (noun)	hemp (noun)
fiber derived from plants	a rope that is used by a hangman to execute persons who have been condemned to death by hanging
	any plant of the genus Cannabis; a coarse bushy annual with palmate leaves and clusters of small green flowers; yields tough fibers and narcotic drugs
	a plant fiber