Holarrhena vs dicot genus

Holarrhena and dicot genus both are nouns.

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

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

Holarrhena: genus of deciduous trees and shrubs of tropical Africa and Asia
dicot genus: genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination

Other hypernyms of Holarrhena include magnoliopsid genus.

Holarrhena (noun)	dicot genus (noun)
genus of deciduous trees and shrubs of tropical Africa and Asia	genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination