bleeder

A person who is easily made to bleed, or who bleeds in unusually large amounts, particularly a hemophiliac.

A blood vessel that requires cauterization etc. to stop it from bleeding during surgery.

Anything that saps a resource produced by something else.

A valve designed to release a small amount of excess pressure from a system.

A troublesome fellow or thing; a blighter.

Synonym of scratch hit.

A person who menstruates (used in the context of transgender inclusivity).