barkeeper vs barkeep

barkeeper and barkeep both are nouns.

Word	Noun	Adjective	Verb	Adverb
barkeeper	Yes	No	No	No
barkeep	Yes	No	No	No

As nouns, barkeeper and barkeep are synonyms defined as:

barkeeper and barkeep: an employee who mixes and serves alcoholic drinks at a bar

Other synonyms of barkeeper include bartender, mixologist.

barkeeper (noun)	barkeep (noun)
an employee who mixes and serves alcoholic drinks at a bar	an employee who mixes and serves alcoholic drinks at a bar