sweet gum tree vs American sweet gum

sweet gum tree and American sweet gum both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet gum tree	Yes	No	No	No
American sweet gum	Yes	No	No	No

As nouns, sweet gum tree and American sweet gum are synonyms defined as:

sweet gum tree and American sweet gum: a North American tree of the genus Liquidambar having prickly spherical fruit clusters and fragrant sap

Other synonyms of sweet gum tree include bilsted, Liquidambar styraciflua, red gum, sweet gum.

sweet gum tree (noun)	American sweet gum (noun)
a North American tree of the genus Liquidambar having prickly spherical fruit clusters and fragrant sap	a North American tree of the genus Liquidambar having prickly spherical fruit clusters and fragrant sap