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.
shammas shamas shammes shammos shams shammies shamos shamus shawms shames shamois shamoys chammies chams shimmies shims shmoes chamisa chamise chamiso chamois siamese shmooze
gammas shammas mammas amas shammes wammus camass shamas zamias sambas commas amahs amass amias ammos camas lemmas gamas gummas lamas lamias llamas mambas gamays mamas mommas gambas summas shammos mas
shammy sham chammy shame shamoy shawm shimmy