The words j, jay sound the same but have different meanings and spellings. Why do j, jay sound the same even though they are completely different words?
The answer is simple: j, jay are homophones of the English language.
The tenth letter of the modern English alphabet.
Any of the speech sounds represented by the letter j.
The tenth in a series.
Something shaped like the letter J.
The letter j.
Any of various often crested birds of the genera Garrulus, Cyanocitta, Aphelocoma, and related genera within the family Corvidae, often having a loud, harsh call. Also called jaybird.
An overly talkative person; a chatterbox.
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.