Agaricus campestris vs field mushroom

Agaricus campestris and field mushroom both are nouns.

Word	Noun	Adjective	Verb	Adverb
Agaricus campestris	Yes	No	No	No
field mushroom	Yes	No	No	No

As nouns, Agaricus campestris and field mushroom are synonyms defined as:

Agaricus campestris and field mushroom: common edible mushroom found naturally in moist open soil; the cultivated mushroom of commerce

Other synonyms of Agaricus campestris include meadow mushroom.

Agaricus campestris (noun)	field mushroom (noun)
common edible mushroom found naturally in moist open soil; the cultivated mushroom of commerce	common edible mushroom found naturally in moist open soil; the cultivated mushroom of commerce