consumption vs eating

consumption and eating both are nouns.

Word	Noun	Adjective	Verb	Adverb
consumption	Yes	No	No	No
eating	Yes	No	No	No

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

consumption: the process of taking food into the body through the mouth (as by eating)
eating: the act of consuming food

Other hyponyms of consumption include feeding, deglutition, drink, swallow, suck, sucking, suction, drinking, imbibing, imbibition.

consumption (noun)	eating (noun)
the act of consuming something	the act of consuming food
the process of taking food into the body through the mouth (as by eating)
(economics) the utilization of economic goods to satisfy needs or in manufacturing
involving the lungs with progressive wasting of the body