drink vs drink in

drink is a noun but drink in is not a noun.

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

As verbs, drink and drink in are synonyms defined as:

drink and drink in: be fascinated or spell-bound by; pay close attention to

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

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