Scleroderma vs fungus genus

Scleroderma and fungus genus both are nouns.

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

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

Scleroderma: genus of poisonous fungi having hard-skinned fruiting bodies: false truffles
fungus genus: includes lichen genera

Scleroderma (noun)	fungus genus (noun)
genus of poisonous fungi having hard-skinned fruiting bodies: false truffles	includes lichen genera