bowstring hemp vs hemp

bowstring hemp and hemp both are nouns.

Word	Noun	Adjective	Verb	Adverb
bowstring hemp	Yes	No	No	No
hemp	Yes	No	No	No

As nouns, hemp is a hypernym of bowstring hemp; that is, hemp is a word with a broader meaning than bowstring hemp:

bowstring hemp (noun)	hemp (noun)
grown as a houseplant for its mottled fleshy sword-shaped leaves or as a source of fiber	a rope that is used by a hangman to execute persons who have been condemned to death by hanging
strong fiber that resembles hemp; obtained from sansevieria and used for e.g. cordage	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
hemp obtained from the sansevieria	a plant fiber