drink vs sip

drink and sip both are nouns.

Word	Noun	Adjective	Verb	Adverb
drink	Yes	No	Yes	No
sip	Yes	No	Yes	No

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

Other hyponyms of drink include aerophagia, draft, draught, gulp, swig.

As verbs, sip is a hyponym of drink; that is, sip is a word with a more specific, narrower meaning than drink:

drink (noun)	sip (noun)
the act of drinking alcoholic beverages to excess	a small drink
the act of swallowing
any liquid suitable for drinking
a single serving of a beverage
any large deep body of water

drink (verb)	sip (verb)
be fascinated or spell-bound by; pay close attention to	drink in sips
take in liquids
consume alcohol
drink excessive amounts of alcohol; be an alcoholic
propose a toast to