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.
oncet onset onside
lancet oncet conceit keenest lanced leanest minced nuanced jounced onset moonset pounced sanest sunset zinced dunnest unset winced inset jaunced nest honest funnest nicety funest finest fenced fainest meanest vainest bounced ponced renest soonest synced danced tannest wannest chanced