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.
shadow shadowy shad shade shady shod shed shat shot chad shote shott shied shoot shoed shoat shout shoddy shooed shittah
meadow shadow dow ado fado meadowy radio roadeo dado widow shadowy
sha shah shaugh shaw shay shea pshaw