tree lupine vs Lupinus arboreus

tree lupine and Lupinus arboreus both are nouns.

Word	Noun	Adjective	Verb	Adverb
tree lupine	Yes	No	No	No
Lupinus arboreus	Yes	No	No	No

As nouns, tree lupine and Lupinus arboreus are synonyms defined as:

tree lupine and Lupinus arboreus: evergreen shrub of the Pacific coast of the United States having showy yellow or blue flowers; naturalized in Australia

tree lupine (noun)	Lupinus arboreus (noun)
evergreen shrub of the Pacific coast of the United States having showy yellow or blue flowers; naturalized in Australia	evergreen shrub of the Pacific coast of the United States having showy yellow or blue flowers; naturalized in Australia