commons vs common land

commons and common land both are nouns.

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

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

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