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.
shady shad shadowy shade shoddy shadow shat chad shod shed shied shoed shoat chatty shitty shooed shittah chat chid shit shot shut
shady had shad gaudy shade chad waddy daddy ready paddy leady lady heady wady head baddy haed hade faddy beady bawdy toady caddy
sha shah shaugh shaw shay shea pshaw