The words bree, brie sound the same but have different meanings and spellings. Why do bree, brie sound the same even though they are completely different words?
The answer is simple: bree, brie are homophones of the English language.
A variety of soft, mild French cheese made from cow’s milk.
Definitions from Wiktionary, Creative Commons Attribution/Share-Alike License and Wordnik.
Homophones (literally "same sound") are usually defined as words that share the same pronunciation, regardless of how they are spelled.