genus Tamus vs plant genus

genus Tamus and plant genus both are nouns.

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

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

genus Tamus: a genus of tuberous vines of the family Dioscoreaceae; has twining stems and heart-shaped leaves and axillary racemes
plant genus: a genus of plants

genus Tamus (noun)	plant genus (noun)
a genus of tuberous vines of the family Dioscoreaceae; has twining stems and heart-shaped leaves and axillary racemes	a genus of plants