common land vs commons

common land and commons both are nouns.

Word	Noun	Adjective	Verb	Adverb
common land	Yes	No	No	No
commons	Yes	No	No	No

As nouns, common land and commons are synonyms defined as:

common land (noun)	commons (noun)
a pasture subject to common use	a class composed of persons lacking clerical or noble rank
	a piece of open land for recreational use in an urban area
	a pasture subject to common use