tillage vs tilled land

tillage and tilled land both are nouns.

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

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

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

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

tillage (noun)	tilled land (noun)
the cultivation of soil for raising crops	arable land that is worked by plowing and sowing and raising crops
arable land that is worked by plowing and sowing and raising crops