Syringa vs genus Syringa

Syringa and genus Syringa both are nouns.

Word	Noun	Adjective	Verb	Adverb
Syringa	Yes	No	No	No
genus Syringa	Yes	No	No	No

As nouns, Syringa and genus Syringa are synonyms defined as:

Syringa and genus Syringa: genus of Old World shrubs or low trees having fragrant flowers in showy panicles: lilacs

Syringa (noun)	genus Syringa (noun)
genus of Old World shrubs or low trees having fragrant flowers in showy panicles: lilacs	genus of Old World shrubs or low trees having fragrant flowers in showy panicles: lilacs