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.
semis seems semes seams simious sims soms sums smews simas somas sumos sambas sambos samosa summas zamias zombis
semis ems mis tamis zombis mems jammies nemas memes koumiss amiss mise mamies mummies amis jimmies lamias miso immies haems geums beams commies deems whammies shimmies shammies teams chemise chammies ramies chamise tommies hems rummies camise poems amies rems remise demies seems demos cammies miss chemos fems femes tammies ylems gimmies chamiso zamias tummies hemes demes jemmies gems emus daimios neems bemas demise hyphemias kumiss mommies neums semes seams roomies remiss reams pommies amias homies memos shamois mammies koumis emes camisa dummies teems chamisa chamois yummies
semi seam seamy seem seme seism