common box vs Buxus sempervirens

common box and Buxus sempervirens both are nouns.

Word	Noun	Adjective	Verb	Adverb
common box	Yes	No	No	No
Buxus sempervirens	Yes	No	No	No

As nouns, common box and Buxus sempervirens are synonyms defined as:

common box and Buxus sempervirens: large slow-growing evergreen shrub or small tree with multiple stems; extensively used for hedges or borders and topiary figures

Other synonyms of common box include European box.

common box (noun)	Buxus sempervirens (noun)
large slow-growing evergreen shrub or small tree with multiple stems; extensively used for hedges or borders and topiary figures	large slow-growing evergreen shrub or small tree with multiple stems; extensively used for hedges or borders and topiary figures