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.
betrays bettors beaters betters biders biters baiters batters bedders bidders beaders budders bitters butters boaters buttress butyrous batteries booteries butteries
betrays strays trays treys tuataras troys daturas derays stroys drays toras trass latrias matrass mattrass nutrias sataras strass straws yttrias sutras tetras tuateras