pastureland vs pasture land

pastureland and pasture land both are nouns.

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

As nouns, pastureland and pasture land are synonyms defined as:

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

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

pastureland (noun)	pasture land (noun)
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