The correct option is A Homonym
'Words different in meaning but similar in sound' is Option A, Homonym. Option B, 'Synonym' is the word that has same meaning as the other word. Option C, 'Acronym' is an abbreviation that is formed by first letters of each word and pronounced like that. Example: NASA. Option D, 'Antonym' is a word that is opposite in meaning to that of the other word. Thus, options B, C and D are incorrect and the correct word for the given phrase is Option A, Homonym.