The words zee, z sound the same but have different meanings and spellings. Why do zee, z sound the same even though they are completely different words?
The answer is simple: zee, z are homophones of the English language.
The 26th letter of the modern English alphabet.
Any of the speech sounds represented by the letter z.
The 26th in a series.
Something shaped like the letter Z.
The letter z.
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.