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.
shad shady shade shadow shed shod shat chad shadowy shoed shied shoat shoddy shooed shittah chat chid shit shot shut cheat chide sheet shoot shote shott shout shute