Syringa villosa vs Japanese lilac

Syringa villosa and Japanese lilac both are nouns.

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

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

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

Syringa villosa (noun)	Japanese lilac (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