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.
saggar sagger seggar saggier saguaro sugar sugary soggier scar saker scaur scary cigar scare sacra sacker scarey scarry soaker soucar sowcar square
beggar eggar muggar saggar seggar gar bagger gagger sagger cigar rigger nigger muggur jagger jaggary jogger sugar jaguar lagger gaur guar hugger aggro beggary jigger agger chigger bugger megara hogger puggry dogger cougar vagary kegger hegari logger lugger agar dagger mugger tugger nagger bigger rugger egger fogger sugary digger tagger wagger chugger
saggy sag saga sago saiga soggy