Ultramarine
The best sailor in the entire navy
Unabridged
A river you have to swim across
Undercover Agent
A spy in bed
Unearth
When a vampire visits a friend
Unit
A term of abuse, as in ' Can't you even spell apple correctly, unit !'
Unlucky
Running into a vampire when you are trying to escape from a werewolf
Unplug
What you should do with an electric chair before you sit down