pest, gnat, flea
Deet, Raid
The word "fire".
a three letter word is bug. Three letter words ending with the letter g are bug and hug.
ant
bug
Dor
pester = bug
Bug
Hug
A four letter word starting with the letter a is able.
It depends on what you mean by 'four letter word'. Thea has four letters, so yes it is. It is not a swear word, so it's not that kind of 'four letter word'.
A four letter word for 'in addition to' is also.