Juncus vs monocot genus

Juncus and monocot genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Juncus	Yes	No	No	No
monocot genus	Yes	No	No	No

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

Juncus: type genus of the Juncaceae; perennial tufted glabrous marsh plants of temperate regions: rushes
monocot genus: genus of flowering plants having a single cotyledon (embryonic leaf) in the seed

Other hypernyms of Juncus include liliopsid genus.

Juncus (noun)	monocot genus (noun)
type genus of the Juncaceae; perennial tufted glabrous marsh plants of temperate regions: rushes	genus of flowering plants having a single cotyledon (embryonic leaf) in the seed