Polygonum vs dicot genus

Polygonum and dicot genus both are nouns.

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

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

Polygonum: diverse genus of herbs or woody subshrubs of north temperate regions
dicot genus: genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination

Other hypernyms of Polygonum include magnoliopsid genus.

Polygonum (noun)	dicot genus (noun)
diverse genus of herbs or woody subshrubs of north temperate regions	genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination