staff vs staffer

staff and staffer both are nouns.

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

staff (noun)	staffer (noun)
a strong rod or stick with a specialized utilitarian purpose	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)
(music) the system of five horizontal lines on which the musical notes are written
a rod carried as a symbol
the body of teachers and administrators at a school
personnel who assist their superior in carrying out an assigned task
building material consisting of plaster and hair; used to cover external surfaces of temporary structure (as at an exposition) or for decoration

staff (verb)	staffer (verb)
provide with staff
serve on the staff of