genus Sesamum vs plant genus

genus Sesamum and plant genus both are nouns.

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

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

genus Sesamum (noun)	plant genus (noun)
tropical African and Indian herbs	a genus of plants