bast vs natural fiber

bast and natural fiber both are nouns.

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

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

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

Other hypernyms of bast include natural fibre.

bast (noun)	natural fiber (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