Marasmius oreades vs fairy-ring mushroom

Marasmius oreades and fairy-ring mushroom both are nouns.

Word	Noun	Adjective	Verb	Adverb
Marasmius oreades	Yes	No	No	No
fairy-ring mushroom	Yes	No	No	No

As nouns, Marasmius oreades and fairy-ring mushroom are synonyms defined as:

Marasmius oreades and fairy-ring mushroom: mushroom that grows in a fairy ring

Marasmius oreades (noun)	fairy-ring mushroom (noun)
mushroom that grows in a fairy ring	mushroom that grows in a fairy ring