loaf
A loaf.
It is "Chapaati". However, chapaati is more formal and the common word used for Indian flat bread is "Roti".
Pone (although it is more commonly called corn pone).
used
Unit. A four letter word beginning with the letter 'u' is unit. Also used, uvea, urea, Utah
User, used.
Edit. The word perfect is used as a verb.
A four letter word starting with the letter a is able.
Game
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.
A four letter word for Seizures is moon