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.
cheapest chippiest choppiest
cheapest pest happiest soapiest loppiest nappiest cuppiest rapist papist hoppiest pappiest soupiest lippiest dippiest zippiest tippiest goopiest typiest quippiest whippiest chippiest loopiest sappiest pesty soppiest mopiest peppiest pipiest gappiest pesto seepiest ropiest deepest zappiest nippiest dopiest hippiest typeset hippest weepiest heppest roupiest ripest choppiest pst
cheapies cheapos cheaps chapeaus chapes chappies chaps cheeps schappes