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.
scopes scops scapes scoops scups scaups scapose skeps skips
copes scopes wicopies scops scapes coupes scoops recoups magpies agapes coops copies cops copse capes recopies cowpeas cowpies gapes goops guppies kewpies koppies kops beaucoups coups wickapes chickpeas