cultivation vs tilling

cultivation and tilling both are nouns.

Word	Noun	Adjective	Verb	Adverb
cultivation	Yes	No	No	No
tilling	Yes	No	No	No

As nouns, tilling is a hyponym of cultivation; that is, tilling is a word with a more specific, narrower meaning than cultivation:

cultivation: (agriculture) production of food by preparing the land to grow crops (especially on a large scale)
tilling: cultivation of the land in order to raise crops

Other hyponyms of cultivation include aquaculture, apiculture, beekeeping, agriculture, farming, husbandry, culture.

cultivation (noun)	tilling (noun)
(agriculture) production of food by preparing the land to grow crops (especially on a large scale)	cultivation of the land in order to raise crops
socialization through training and education to develop one's mind or manners
the act of raising or growing plants (especially on a large scale)
the process of fostering the growth of something
a highly developed state of perfection; having a flawless or impeccable quality