tilled land vs tillage

tilled land and tillage both are nouns.

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

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

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

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

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