staff / staph are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
staff: (noun) personnel who assist their superior in carrying out an assigned task. (noun) a strong rod or stick with a specialized utilitarian purpose. (noun) the body of teachers and administrators at a school. (noun) building material consisting of plaster and hair; used to cover external surfaces of temporary structure (as at an exposition) or for decoration. (noun) a rod carried as a symbol. (noun) (music) the system of five horizontal lines on which the musical notes are written. (verb) provide with staff. (verb) serve on the staff of.
staph: NA
staff: s·t·AE·f
staph: s·t·AE·f
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)