I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
recaps recoups recopies reequips
becaps toecaps caps recaps kneecaps cups cops scups gaps scaups capes capos okapis gapes gawps scapes kapas scops agapes teacups kakapos wickapes
recap recopy recoup recoupe breakup precoup