A _THUG might be called something else when converting cultures.
While a _THUG might seek Zeus for conversion, a FLY_E_R might seek Athena. Or was it Minerva?
Converting ZEUS to JUPITER requires spinning each disk a certain number of notches.
If you start with _THUG (that is, a blank space followed by THUG) in the encoder instead, you'll get a new word.
The Zeus encoding won't work for DAG_GER though. For that you'll need another Olympian.
If you're not sure where to go next, reading the right column's clues in the order given by alphabetising their answers should help.