bartender vs employee

bartender and employee both are nouns.

Word	Noun	Adjective	Verb	Adverb
bartender	Yes	No	No	No
employee	Yes	No	No	No

As nouns, employee is a hypernym of bartender; that is, employee is a word with a broader meaning than bartender:

bartender (noun)	employee (noun)
an employee who mixes and serves alcoholic drinks at a bar	a worker who is hired to perform a job