plowland vs ploughland

plowland and ploughland both are nouns.

Word	Noun	Adjective	Verb	Adverb
plowland	Yes	No	No	No
ploughland	Yes	No	No	No

As nouns, plowland and ploughland are synonyms defined as:

plowland and ploughland: arable land that is worked by plowing and sowing and raising crops

Other synonyms of plowland include cultivated land, farmland, tillage, tilled land, tilth.

plowland (noun)	ploughland (noun)
arable land that is worked by plowing and sowing and raising crops	arable land that is worked by plowing and sowing and raising crops