Heliport is correct. Gommorah I'm sure is correct but 3D using the 'o' to start the word wil not fit. 16D I think is evil but I cant make out the next 4 letter word.
Evildoer is correct, gommorah is also correct but I have to use the O in Gommorah to begin 3D, that would give me O?N?N?O which I cannot resolve. Thank you.