ruby wood vs red saunders

ruby wood and red saunders both are nouns.

Word	Noun	Adjective	Verb	Adverb
ruby wood	Yes	No	No	No
red saunders	Yes	No	No	No

ruby wood (noun)	red saunders (noun)
hard durable wood of red sandalwood trees (Pterocarpus santalinus); prized for cabinetwork	tree of India and East Indies yielding a hard fragrant timber prized for cabinetwork and dark red heartwood used as a dyewood