Board Thread:Character Discussion/@comment-24018644-20150413153456/@comment-1894786-20151023221344

Wicked and Evil do actually have different connotations. Evil is going against morality. Wicked is a subset of evil, in which you're intentionally focusing on harming others.

Regina has shown wickedness, but she's also shown evil. Zelena has only ever been seen harming others, so she's only shown wickedness.