The words brassie, brassy sound the same but have different meanings and spellings. Why do brassie, brassy sound the same even though they are completely different words?
The answer is simple: brassie, brassy are homophones of the English language.
A golf club with a brass-plated sole and a wooden head, used for long low shots; a two wood.
Variant of brassie.
Informal Brazen; insolent.
Cheap and showy; flashy.
Music Resembling or characterized by the sound of brass instruments: "The band was now playing some brassy march” ( Robert Penn Warren).
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.