Answer:

1 N
2 E
3 R
4 O

There are 315 possible clues that match this answer.



Definition
n. A Roman emperor notorius for debauchery and barbarous cruelty; hence, any profligate and cruel ruler or merciless tyrant.

Answers Like NERO
NEAR NOR NER NRA NEER NARY NOOR NOIRE NEURO