The words gammon, gamin sound the same but have different meanings and spellings. Why do gammon, gamin sound the same even though they are completely different words?
The answer is simple: gammon, gamin are homophones of the English language.
An often homeless boy who roams about the streets; an urchin.
A victory in backgammon reached before the loser has succeeded in removing a single piece.
To defeat in backgammon by scoring a gammon.
Misleading or nonsensical talk; humbug.
Definitions from The American Heritage® Dictionary of the English Language, 4th Edition and Wordnik.
Homophones (literally "same sound") are usually defined as words that share the same pronunciation, regardless of how they are spelled.