tank farming vs farming

tank farming and farming both are nouns.

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

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

tank farming: a technique of growing plants (without soil) in water containing dissolved nutrients
farming: the practice of cultivating the land or raising stock

Other hypernyms of tank farming include agriculture, husbandry.

tank farming (noun)	farming (noun)
a technique of growing plants (without soil) in water containing dissolved nutrients	the practice of cultivating the land or raising stock
	agriculture considered as an occupation or way of life

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