pastureland vs commons

pastureland and commons both are nouns.

Word	Noun	Adjective	Verb	Adverb
pastureland	Yes	No	No	No
commons	Yes	No	No	No

As nouns, commons is a hyponym of pastureland; that is, commons is a word with a more specific, narrower meaning than pastureland:

pastureland: a field covered with grass or herbage and suitable for grazing by livestock
commons: a pasture subject to common use

Other hyponyms of pastureland include common land, cow pasture.

pastureland (noun)	commons (noun)
a field covered with grass or herbage and suitable for grazing by livestock	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