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.
sagger saggier saggar soggier saker soaker seggar sacker saguaro scar scaur sugar skier siker sacra scare scary sucker square sowcar soucar sicker skerry seeker secure scarry scarey sugary scoriae suckier
agger dagger sagger tagger nagger lagger logger kegger nigger hogger gagger mugger chigger egger rigger jagger chugger bagger dogger wagger digger lugger jogger hugger jigger fogger bugger tugger rugger bigger baggier piggery naggier eggar saggar doggery waggery leggier vuggier leaguer puggier jaggery muggar piggier wiggier buggery seggar aggro jiggier muggier goer doggier foggier puggry fuggier boggier jaggier beggar muggur quaggier faggier saggier buggier wiggery loggier vaguer soggier toggery voguer shaggier
saggy sag saga sago saiga soggy