tilled land vs farmland

tilled land and farmland both are nouns.

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

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

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

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

tilled land (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