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.
canst canasta canniest canoeist gainst conceit keenest conicity gainsaid gooniest coenocyte
canst nasty dynasty dunnest soonest cineaste renest moonset meanest hyponasty nest fainest finest funest funnest unset tannest vainest honest hymnist dynast sunset sanest cineast pianist monist onset inset leanest keenest gainst canasta hygienist tennist tanist wannest
cans canso cains canes cannas canoes cons scans