farming vs occupation

farming and occupation both are nouns.

Word	Noun	Adjective	Verb	Adverb
farming	Yes	Yes	No	No
occupation	Yes	No	No	No

As nouns, occupation is a hypernym of farming; that is, occupation is a word with a broader meaning than farming:

Other hypernyms of farming include business, job, line, line of work.

farming (noun)	occupation (noun)
the practice of cultivating the land or raising stock	the principal activity in your life that you do to earn money
agriculture considered as an occupation or way of life	the act of occupying or taking possession of a building
	the control of a country by military forces of a foreign power
	any activity that occupies a person's attention
	the period of time during which a place or position or nation is occupied

farming (adjective)	occupation (adjective)
relating to farming or agriculture