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.
geums gems gyms gimmes jumbos gimmies jemmies jams
neums geums ems doums dumbs deems demos semes sumos rems seams pneumas pumas femes haems heaumes hums chemos kumys gems fumes humus gaums hems lumas ylems memos mumms mumus nemas koumis teems koumys fems mums lums loumas hemes beams emus neumes gums meous emeus emes bums bemas neems memes mems numbs poems reams rums seems semis sums demes doumas dumas teams timeous chums