farmland vs farming area

farmland and farming area both are nouns.

Word	Noun	Adjective	Verb	Adverb
farmland	Yes	No	No	No
farming area	Yes	No	No	No

As nouns, farmland and farming area are synonyms defined as:

farmland (noun)	farming area (noun)
a rural area where farming is practiced	a rural area where farming is practiced
arable land that is worked by plowing and sowing and raising crops