Exacum vs magnoliopsid genus

Exacum and magnoliopsid genus both are nouns.

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

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

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

Other hypernyms of Exacum include dicot genus.

Exacum (noun)	magnoliopsid 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