Here are some examples of words with the prefix "hem":
* Hemoglobin: The protein in red blood cells that carries oxygen.
* Hematoma: A localized collection of blood outside of blood vessels.
* Hemophilia: A genetic disorder that impairs the body's ability to control blood clotting.
* Hemodialysis: A treatment for kidney failure that uses a machine to filter the blood.
However, it's important to note that "hem" can also sometimes mean "half". This is less common, but occurs in words like "hemisphere".