* τέχνης (téchnēs): This refers to an art or craft in general, and can sometimes be used to describe a craftsman, especially when referring to someone skilled in a particular art. It's more about the skill than the person themselves.
* τέκτων (tékton): This specifically refers to a carpenter or builder. It's a more concrete term.
* δημιουργός (dēmiourgós): This means "creator" or "maker" and could be used for a craftsman, especially one who creates something artistic or innovative.
* χειροτέχνης (cheirotéchnēs): This literally means "hand-craftsman" and is a more general term encompassing various crafts. This is probably the closest single-word equivalent.
The best choice depends on the context. For a general craftsman, χειροτέχνης (cheirotéchnēs) is a safe bet.