birthday* = the day you were born bird day = the day of the birds !!!! The pronunciation is almost the same... =)

Although they are different words with different meanings, but you asked about pronunciation, so you can pronounce them both alike. Just the little difference will be in the "th" and "d" in the end.

Hi... No the pronunciation is different in "birthday" you have to pronounce "th" as the English sound... Check that on a vocal site...