staff member vs staff

staff member and staff both are nouns.

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

staff member (noun)	staff (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 strong rod or stick with a specialized utilitarian purpose
	(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 member (verb)	staff (verb)
	provide with staff
	serve on the staff of