bast vs natural fibre

bast and natural fibre both are nouns.

Word	Noun	Adjective	Verb	Adverb
bast	Yes	No	No	No
natural fibre	Yes	No	No	No

As nouns, natural fibre is a hypernym of bast; that is, natural fibre is a word with a broader meaning than bast:

bast: strong woody fibers obtained especially from the phloem of from various plants
natural fibre: fiber derived from plants or animals

Other hypernyms of bast include natural fiber.

bast (noun)	natural fibre (noun)
(botany) tissue that conducts synthesized food substances (e.g., from leaves) to parts where needed; consists primarily of sieve tubes	fiber derived from plants or animals
strong woody fibers obtained especially from the phloem of from various plants