rose vs Rosa banksia

rose and Rosa banksia both are nouns.

Word	Noun	Adjective	Verb	Adverb
rose	Yes	Yes	No	No
Rosa banksia	Yes	No	No	No

As nouns, Rosa banksia is a hyponym of rose; that is, Rosa banksia is a word with a more specific, narrower meaning than rose:

rose: any of many shrubs of the genus Rosa that bear roses
Rosa banksia: Chinese evergreen climbing rose with yellow or white single flowers

rose (noun)	Rosa banksia (noun)
a dusty pink color	Chinese evergreen climbing rose with yellow or white single flowers
pinkish table wine from red grapes whose skins were removed after fermentation began
any of many shrubs of the genus Rosa that bear roses

rose (adjective)	Rosa banksia (adjective)
of something having a dusty purplish pink color