The words jay, j sound the same but have different meanings and spellings. Why do jay, j sound the same even though they are completely different words?
The answer is simple: jay, j 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.