bast fiber vs bast

bast fiber and bast both are nouns.

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

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

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

bast fiber (noun)	bast (noun)
strong woody fibers obtained especially from the phloem of from various plants	(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