staffer vs employee

staffer and employee both are nouns.

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

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

staffer: an employee who is a member of a staff of workers (especially a member of the staff that works for the President of the United States)
employee: a worker who is hired to perform a job

staffer (noun)	employee (noun)
an employee who is a member of a staff of workers (especially a member of the staff that works for the President of the United States)	a worker who is hired to perform a job