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.
scops scoops scopes scups scapes scaups scapose skeps skips
cops scops teacups kops scopes scoops recoups recaps kneecaps becaps caps beaucoups goops cups coups copse copes coops scups toecaps