pasture vs pastureland

pasture and pastureland both are nouns.

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

As nouns, pasture and pastureland are synonyms defined as:

pasture and pastureland: a field covered with grass or herbage and suitable for grazing by livestock

Other synonyms of pasture include grazing land, lea, ley, pasture land.

pasture (noun)	pastureland (noun)
bulky food like grass or hay for browsing or grazing horses or cattle	a field covered with grass or herbage and suitable for grazing by livestock
a field covered with grass or herbage and suitable for grazing by livestock

pasture (verb)	pastureland (verb)
feed as in a meadow or pasture
let feed in a field or pasture or meadow