pasture land vs pastureland

pasture land and pastureland both are nouns.

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

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

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

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

pasture land (noun)	pastureland (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