man-on-a-horse vs Tricholoma flavovirens

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

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

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

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

man-on-a-horse (noun)	Tricholoma flavovirens (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