rayon vs viscose rayon

rayon and viscose rayon both are nouns.

Word	Noun	Adjective	Verb	Adverb
rayon	Yes	No	No	No
viscose rayon	Yes	No	No	No

As nouns, viscose rayon is a hyponym of rayon; that is, viscose rayon is a word with a more specific, narrower meaning than rayon:

Other hyponyms of rayon include acetate, acetate rayon, viscose.

rayon (noun)	viscose rayon (noun)
a synthetic silklike fabric	a rayon fabric made from viscose (cellulose xanthate) fibers