Claviceps vs fungus genus

Claviceps and fungus genus both are nouns.

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

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

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