pastureland vs grazing land

pastureland and grazing land both are nouns.

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

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

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

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

pastureland (noun)	grazing 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