satin walnut vs gumwood

satin walnut and gumwood both are nouns.

Word	Noun	Adjective	Verb	Adverb
satin walnut	Yes	No	No	No
gumwood	Yes	No	No	No

As nouns, gumwood is a hypernym of satin walnut; that is, gumwood is a word with a broader meaning than satin walnut:

satin walnut: reddish-brown wood and lumber from heartwood of the sweet gum tree used to make furniture
gumwood: wood or lumber from any of various gum trees especially the sweet gum

Other hypernyms of satin walnut include gum.

satin walnut (noun)	gumwood (noun)
reddish-brown wood and lumber from heartwood of the sweet gum tree used to make furniture	wood or lumber from any of various gum trees especially the sweet gum