bast vs bast fiber

bast and bast fiber both are nouns.

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

As nouns, bast and bast fiber are synonyms defined as:

bast and bast fiber: strong woody fibers obtained especially from the phloem of from various plants

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