uptake vs eating

uptake and eating both are nouns.

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

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

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

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

uptake (noun)	eating (noun)
the process of taking food into the body through the mouth (as by eating)	the act of consuming food
a process of taking up or using up or consuming