What kind of water would Oxygen-15 and tritium create?

I've recently become interested in chemistry, and have some questions about water.

I've heard of semi-heavy, heavy, tritiated, and oxygen-heavy water. However, what about various combinations of isotopes? Let's say: Oxygen 15 + Tritium? How about Oxygen 18 + Deuterium?

Would these all have distinct properties from one another? Have all the stable combinations been extensively studied and lab tested?