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.
chigger chugger chokier cheekier shaggier choker checker shicker chequer chukker chicory shikker shakier checkrow chickory chickaree chakra chukar shaker shikar chukkar shikari shocker shucker
bigger chigger digger nigger jigger rigger loggier lugger rugger soggier agger mugger nagger bugger baggier jaggery bagger hugger kegger jagger puggier piggier gagger jiggier doggery tagger tugger waggery egger chugger leggier piggery fogger vuggier buggier quaggier jogger faggier naggier muggier lagger logger boggier hogger buggery wiggier saggier jaggier fuggier foggier dagger dogger doggier toggery wagger wiggery sagger shaggier