professor [professors](a higher ranking for a teacher or faculty member at a college or university) noun [UK: prə.ˈfe.sə(r)] [US: prə.ˈfe.sər]They are professors. = Sono professori.
teacher [teachers](person who teaches) noun [UK: ˈtiː.tʃə(r)] [US: ˈtiː.tʃər]I'm a teacher. = Sono un professore.
professoressa noun {f}
teacher [teachers](female who teaches) noun [UK: ˈtiː.tʃə(r)] [US: ˈtiː.tʃər]You are teachers. = Siete professoresse.