Armillaria zelleri vs agaric

Armillaria zelleri and agaric both are nouns.

Word	Noun	Adjective	Verb	Adverb
Armillaria zelleri	Yes	No	No	No
agaric	Yes	No	No	No

As nouns, agaric is a hypernym of Armillaria zelleri; that is, agaric is a word with a broader meaning than Armillaria zelleri:

Armillaria zelleri: a large fungus with viscid cap that dries and turns brown with age; gills are off-white
agaric: a saprophytic fungus of the order Agaricales having an umbrellalike cap with gills on the underside

Armillaria zelleri (noun)	agaric (noun)
a large fungus with viscid cap that dries and turns brown with age; gills are off-white	a saprophytic fungus of the order Agaricales having an umbrellalike cap with gills on the underside
	fungus used in the preparation of punk for fuses