The words bootee, booty sound the same but have different meanings and spellings. Why do bootee, booty sound the same even though they are completely different words?
The answer is simple: bootee, booty are homophones of the English language.
A soft, usually knitted shoe for a baby.
An ankle-length disposable foot covering, used by medical personnel and others in sterile environments.
Plunder taken from an enemy in time of war.
Goods or property seized by force or piracy.
A valuable prize, award, or gain.
Slang The buttocks.
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.
If they are spelled the same then they are also homographs (and homonyms); if they are spelled differently then they are also heterographs (literally "different writing").