lily-of-the-valley tree vs Pieris japonica

lily-of-the-valley tree and Pieris japonica both are nouns.

Word	Noun	Adjective	Verb	Adverb
lily-of-the-valley tree	Yes	No	No	No
Pieris japonica	Yes	No	No	No

As nouns, lily-of-the-valley tree and Pieris japonica are synonyms defined as:

lily-of-the-valley tree and Pieris japonica: broad-leaved evergreen Asiatic shrub with glossy leaves and drooping clusters of white flowers

Other synonyms of lily-of-the-valley tree include andromeda, Japanese andromeda.

lily-of-the-valley tree (noun)	Pieris japonica (noun)
broad-leaved evergreen Asiatic shrub with glossy leaves and drooping clusters of white flowers	broad-leaved evergreen Asiatic shrub with glossy leaves and drooping clusters of white flowers