Citrullus vs dicot genus

Citrullus and dicot genus both are nouns.

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

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

Citrullus: a dicot genus of the family Cucurbitaceae including watermelons
dicot genus: genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination

Other hypernyms of Citrullus include magnoliopsid genus.

Citrullus (noun)	dicot genus (noun)
a dicot genus of the family Cucurbitaceae including watermelons	genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination