Syringa vs dicot genus

Syringa and dicot genus both are nouns.

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

As nouns, dicot genus is a hypernym of Syringa; that is, dicot genus is a word with a broader meaning than Syringa:

Syringa: genus of Old World shrubs or low trees having fragrant flowers in showy panicles: lilacs
dicot genus: genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination

Other hypernyms of Syringa include magnoliopsid genus.

Syringa (noun)	dicot genus (noun)
genus of Old World shrubs or low trees having fragrant flowers in showy panicles: lilacs	genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination