Hygrophorus russula vs waxycap

Hygrophorus russula and waxycap both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hygrophorus russula	Yes	No	No	No
waxycap	Yes	No	No	No

As nouns, waxycap is a hypernym of Hygrophorus russula; that is, waxycap is a word with a broader meaning than Hygrophorus russula:

Hygrophorus russula: an edible fungus with a reddish cap and close pale gills and dry stalk; found under hardwoods
waxycap: any fungus of the family Hygrophoraceae having gills that are more or less waxy in appearance

Hygrophorus russula (noun)	waxycap (noun)
an edible fungus with a reddish cap and close pale gills and dry stalk; found under hardwoods	any fungus of the family Hygrophoraceae having gills that are more or less waxy in appearance