professor vs staff

professor and staff both are nouns.

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

professor (noun)	staff (noun)
someone who is a member of the faculty at a college or university	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

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