Werewolves are stronger, speedier and more resilient than vampires
^ They cancel each other out really. It takes a lot to kill either of them. They would need the help of a demon or something higher level than themselves.
For an alternate view of the question, read *Thud*, by Terry Pratchett, with specific regard to the relationship between Angua and Sally. Heck, read it even if you don't care about the question.
I guess it is possible for that to happen, but unliekly
The same way a human would.
No, they can only kill during a full moon when they are transformed into a werewolf. Unless they are a serial killer. Then they can kill whenever they please.
a werewolf can simply kill them with a twist of the neck
Werewolves are believed to hunt and kill vampires, because one bite from a werewolf can kill a vampire. Therefore, werewolves are often found close behind vampires, as the werewolves will be tracking the vampire as its prey.
nothing eats vampires but a werewolf bite can kill a vampire
a Lycan or a Vampire-Werewolf hybrid
Vampire vs. Werewolf: The Game
She Is A Werewolf and a vampire
she is your step sister or one of your parents is a werewolf and the other is a vampire
Beast + Wrath
Vampire