staff member vs staffer

staff member and staffer both are nouns.

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

As nouns, staff member and staffer are synonyms defined as:

staff member and 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)

staff member (noun)	staffer (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)	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)