The correct answer is: sounds.
A homophone is a word that is pronounced the same as another word but differs in meaning. In other words, homophones have the same sound. There may also be a difference in spelling. The term homophones applies also to phrases, letters or groups of letters. Some examples of homophones in English are : add-ad, mail-male, sea-see, team-teem.
Writers should always check to make sure their homophones are used accurately because if confused, they can totally change the meaning of the written sentence and its significance.