The homophone for duel is dual.
There aren't any.
A homophone is a word that is pronounced the same (sounds the same) as another word but means something else and is spelled differently, e.g. bare, bear bread, bred cue, queue die, dye know, no mind,...
Awn is one. There may be differences based on individual pronunciation.
I want to buy a book written by Stephen King.Say good-bye to Mom.