soapberry vs soapberry tree

soapberry and soapberry tree both are nouns.

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

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

soapberry and soapberry tree: a tree of the genus Sapindus whose fruit is rich in saponin

soapberry (noun)	soapberry tree (noun)
a tree of the genus Sapindus whose fruit is rich in saponin	a tree of the genus Sapindus whose fruit is rich in saponin