prisons is a form of:

Scavenger



noun
1.
(one who gathers refuse and rubbish from houses and streets, any of various birds, animals, of fish that eat waste matter and spoiled food, animal which feeds on carrion; scavenge) សត្វដើររកអាហារខ្លួនឯង
ENGLISH MEANING
noun
1.
A person whose employment is to clean the streets of a city, by scraping or sweeping, and carrying off the filth. The name is also applied to any animal which devours refuse, carrion, or anything injurious to health.