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.
rammy rummy ram rami ream rimy roam ramee ramie roomy rem rim rom rum rime room
hammy shammy rammy mammy jammy chammy whammy tammy gammy whammo gamay foamy rummy lamby gamey tommy gamy mamma pommy gummy emmy mommy shimmy dummy chummy gamma jimmy jemmy shamoy mammey tummy loamy seamy gemmy mamey mummy ammo immy beamy commy yummy