ebony tree vs ebony

ebony tree and ebony both are nouns.

Word	Noun	Adjective	Verb	Adverb
ebony tree	Yes	No	No	No
ebony	Yes	Yes	No	No

As nouns, ebony tree and ebony are synonyms defined as:

ebony tree and ebony: tropical tree of southern Asia having hard dark-colored heartwood used in cabinetwork

Other synonyms of ebony tree include Diospyros ebenum.

ebony tree (noun)	ebony (noun)
tropical tree of southern Asia having hard dark-colored heartwood used in cabinetwork	a very dark black
	tropical tree of southern Asia having hard dark-colored heartwood used in cabinetwork
	hard dark-colored heartwood of the ebony tree; used in cabinetwork and for piano keys

ebony tree (adjective)	ebony (adjective)
	of a very dark black