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.
twains twins twines dewans diwans dwines tweens deewans dewiness tweeness tweenies twoonies
wains twains swains rawins twines deewans lawines dwines dewans swans sewans jawans sowans seawans rewins lauwines wins gowans diwans rowans wanes winos wines whins whines weans wans bwanas twins