genus Claviceps vs fungus genus

genus Claviceps and fungus genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Claviceps	Yes	No	No	No
fungus genus	Yes	No	No	No

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

genus Claviceps (noun)	fungus genus (noun)
fungi parasitic upon the ovaries of various grasses	includes lichen genera