gnawer
nounUK /ˈnɔː.ər/
US /ˈnɔː.ɚ/
A gnawer is an animal that bites and chews on things with its teeth.
The beaver is a famous gnawer that cuts down trees with its strong teeth.
OTHER MEANINGS
2. A person who keeps worrying or bothering someone about something.
He was a constant gnawer, always asking about the money he lent me.
3. A tool or machine that wears something down by rubbing or biting into it.
The old drill was a slow gnawer of metal.
4. Any animal with front teeth made for scraping or biting food.
Rats and squirrels are common gnawers in city parks.