drink in vs drink

drink in is not a noun while drink is a noun.

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

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

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

drink in (noun)	drink (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 in (verb)	drink (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