Rumex vs magnoliopsid genus

Rumex and magnoliopsid genus both are nouns.

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

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

Rumex: docks: coarse herbs and shrubs mainly native to north temperate regions
magnoliopsid genus: genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination

Other hypernyms of Rumex include dicot genus.

Rumex (noun)	magnoliopsid genus (noun)
docks: coarse herbs and shrubs mainly native to north temperate regions	genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination