bloodsucker

noun5

1. •
   An animal or insect that drinks the blood of others, especially by sucking blood through a puncture wound; a leech, mosquito etc.

   • I once saw a boy who waded beyond the gravel walk out of the water with bloodsuckers fringing his ankles like leaves. — 1975
2. •
   A supernatural being who feeds on (especially human) blood; a vampire.
3. •
   (disapproving, figurative) Someone who preys on others, or who attempts to take as much from others as possible; an extortioner; a leech.
4. •
   Someone who sheds blood; a bloodthirsty person; a violent criminal.
5. •
   Any of various lizards of the family Agamidae, especially the changeable lizard (Calotes versicolor) of Asia, and the jacky dragon of Australia, Amphibolurus muricatus.