A teacher or lecturer at some universities (in central Europe, etc.)
A tour guide at a museum, art gallery, historical site, etc.
Instructive; that teaches.
A teacher or faculty member at a college or university regardless of formal rank.
The most senior rank for an academic at a university or similar institution, informally also known as "full professor."
A pianist in a saloon, brothel, etc.
The puppeteer who performs a Punch and Judy show; a Punchman.