honey fungus vs Armillariella mellea

honey fungus and Armillariella mellea both are nouns.

Word	Noun	Adjective	Verb	Adverb
honey fungus	Yes	No	No	No
Armillariella mellea	Yes	No	No	No

As nouns, honey fungus and Armillariella mellea are synonyms defined as:

honey fungus and Armillariella mellea: a honey-colored edible mushroom commonly associated with the roots of trees in late summer and fall; do not eat raw

Other synonyms of honey fungus include honey mushroom.

honey fungus (noun)	Armillariella mellea (noun)
a honey-colored edible mushroom commonly associated with the roots of trees in late summer and fall; do not eat raw	a honey-colored edible mushroom commonly associated with the roots of trees in late summer and fall; do not eat raw