Linum vs plant genus

Linum and plant genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Linum	Yes	No	No	No
plant genus	Yes	No	No	No

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

Linum: a herbaceous plant genus of the family Linaceae with small sessile leaves
plant genus: a genus of plants

Linum (noun)	plant genus (noun)
a herbaceous plant genus of the family Linaceae with small sessile leaves	a genus of plants