Tuber vs fungus genus

Tuber and fungus genus both are nouns.

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

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

Tuber: type genus of the Tuberaceae: fungi whose fruiting bodies are typically truffles
fungus genus: includes lichen genera

Tuber (noun)	fungus genus (noun)
type genus of the Tuberaceae: fungi whose fruiting bodies are typically truffles	includes lichen genera