The words k, kay sound the same but have different meanings and spellings. Why do k, kay sound the same even though they are completely different words?
The answer is simple: k, kay are homophones of the English language.
The 11th letter of the modern English alphabet.
Any of the speech sounds represented by the letter k.
The 11th in a series.
Something shaped like the letter K.
The letter k.
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.