genus Rheum vs dicot genus

genus Rheum and dicot genus both are nouns.

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

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

genus Rheum: rhubarb
dicot genus: genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination

Other hypernyms of genus Rheum include magnoliopsid genus.

genus Rheum (noun)	dicot genus (noun)
rhubarb	genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination