Tricholoma flavovirens vs man-on-a-horse

Tricholoma flavovirens and man-on-a-horse both are nouns.

Word	Noun	Adjective	Verb	Adverb
Tricholoma flavovirens	Yes	No	No	No
man-on-a-horse	Yes	No	No	No

As nouns, Tricholoma flavovirens and man-on-a-horse are synonyms defined as:

Tricholoma flavovirens and man-on-a-horse: an edible agaric with yellow gills and a viscid yellow cap that has a brownish center

Tricholoma flavovirens (noun)	man-on-a-horse (noun)
an edible agaric with yellow gills and a viscid yellow cap that has a brownish center	an edible agaric with yellow gills and a viscid yellow cap that has a brownish center