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.
squares squires sugars sucres scares squarrose soucars secures saguaros scars scurries scries scaurs screws scores screes scarce scours sakers sucrase sucrose sackers saggers sowcars seggars suckers saggars soakers scariose scarious skerries cigars skiers skirrs secrecy seekers
squares cares scares requires pugarees cougars lucres caries cures curies jaggaries guars kauries decares sugars dekares squires chukars soucars quaeres quires eagres saguaros puggarees nacres jaguars ligures figures fiacres vagaries acres beggaries auguries daycares sucres decuries caress chickarees secures shikarees