plowland vs tilled land

plowland and tilled land both are nouns.

Word	Noun	Adjective	Verb	Adverb
plowland	Yes	No	No	No
tilled land	Yes	No	No	No

As nouns, plowland and tilled land are synonyms defined as:

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

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

plowland (noun)	tilled land (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