sandy mushroom vs Tricholoma populinum

sandy mushroom and Tricholoma populinum both are nouns.

Word	Noun	Adjective	Verb	Adverb
sandy mushroom	Yes	No	No	No
Tricholoma populinum	Yes	No	No	No

As nouns, sandy mushroom and Tricholoma populinum are synonyms defined as:

sandy mushroom and Tricholoma populinum: an edible agaric that fruits in great clusters (especially in sandy soil under cottonwood trees)

sandy mushroom (noun)	Tricholoma populinum (noun)
an edible agaric that fruits in great clusters (especially in sandy soil under cottonwood trees)	an edible agaric that fruits in great clusters (especially in sandy soil under cottonwood trees)