Yandere vs. Tsundere: What's the Difference?

Yandere and Tsundere Definitions
Yandere
A character, usually a girl, who has an obsessive and possessive side in regards to their crush, ready to use violent and murderous means to maintain an exclusive bond.
Tsundere
A cold, nitpicky character, usually a girl, who conceals (without complete success) a bashfulness in the presence of their crush.
Tsundere
Showing qualities typical of a tsundere.