farmland vs tilth

farmland and tilth both are nouns.

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

As nouns, farmland and tilth are synonyms defined as:

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

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

farmland (noun)	tilth (noun)
a rural area where farming is practiced	arable land that is worked by plowing and sowing and raising crops
arable land that is worked by plowing and sowing and raising crops	the state of aggregation of soil and its condition for supporting plant growth