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.
kashas cashaws cashes gashes cashews cashoos cushaws quashes gashouse coshes gushes cuishes gotchas
geishas pashas kashas boshes moshes meshes shays fashes coshes pachas sashes chias lashes chays chaws cushaws chase lushes sheas whishes shaws rashes choushes wishes gnashes nachas pashes pshaws rishis tushes cashaws rushes zoysias dashes datchas dishes shahs chaos hashes reshes shes ashes bashes pushes pishes whooshes sushis fishes sashays dashis dachas toshes deashes joshes gotchas mashes hushes roshis chais gushes noshes knishes mushes mochas leashes wooshes quashes bushes cuishes gashes cashes bashaws washes shushes
kasha cash cashaw cashew cashoo gash