uptake vs sucking

uptake and sucking both are nouns.

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

As nouns, sucking is a hyponym of uptake; that is, sucking 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)
sucking: the act of sucking

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

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