plowland vs farmland

plowland and farmland both are nouns.

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

As nouns, plowland and farmland are synonyms defined as:

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

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

plowland (noun)	farmland (noun)
arable land that is worked by plowing and sowing and raising crops	a rural area where farming is practiced
	arable land that is worked by plowing and sowing and raising crops