Japanese lilac vs Syringa villosa

Japanese lilac and Syringa villosa both are nouns.

Word	Noun	Adjective	Verb	Adverb
Japanese lilac	Yes	No	No	No
Syringa villosa	Yes	No	No	No

As nouns, Japanese lilac and Syringa villosa are synonyms defined as:

Japanese lilac and Syringa villosa: lilac of northern China having ovate leaves and profuse early summer rose-lilac flowers

Japanese lilac (noun)	Syringa villosa (noun)
lilac of northern China having ovate leaves and profuse early summer rose-lilac flowers	lilac of northern China having ovate leaves and profuse early summer rose-lilac flowers