Basically just read every noun, and then think about what the name is for a person who does that job. (Ex. a person who does music is a musician.) Then sort them based off what they end in.
But here are the ones you haven't crossed off:
Entertainer, gardener, typist, mathetician, competitor, visitor, server/servant (could be either one, both are words) juggler, attendant (although it could also be attendee, which is a rarer suffix)
Hope this helps :)