staff vs staff member

staff and staff member both are nouns.

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

staff (noun)	staff member (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)	staff member (verb)
provide with staff
serve on the staff of