ash tree vs ash

ash tree and ash both are nouns.

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

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

ash tree and ash: any of various deciduous pinnate-leaved ornamental or timber trees of the genus Fraxinus

ash tree (noun)	ash (noun)
any of various deciduous pinnate-leaved ornamental or timber trees of the genus Fraxinus	any of various deciduous pinnate-leaved ornamental or timber trees of the genus Fraxinus
	strong elastic wood of any of various ash trees; used for furniture and tool handles and sporting goods such as baseball bats
	the residue that remains when something is burned

ash tree (verb)	ash (verb)
	convert into ashes