Common countable noun; the plural is regular.
Definitionen
An animal that eats meat rather than plants; a carnivore. A lion is a flesh-eater.
A person, creature, or being that eats flesh. In the legend, the monster was a flesh-eater.
Attributive use: describing something relating to flesh-eaters.
Definitionen
Relating to or characteristic of flesh-eaters. The fossil belongs to a flesh-eater species.