Exacum vs dicot genus

Exacum and dicot genus both are nouns.

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

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

Exacum: genus of tropical Asiatic and African plants: especially Persian violets
dicot genus: genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination

Other hypernyms of Exacum include magnoliopsid genus.

Exacum (noun)	dicot genus (noun)
genus of tropical Asiatic and African plants: especially Persian violets	genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination