Oenothera vs magnoliopsid genus

Oenothera and magnoliopsid genus both are nouns.

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

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

Oenothera: chiefly North American herbs with usually nocturnal flowers
magnoliopsid genus: genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination

Other hypernyms of Oenothera include dicot genus.

Oenothera (noun)	magnoliopsid genus (noun)
chiefly North American herbs with usually nocturnal flowers	genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination