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.
planes plans plains plainness paleness pleons pylons paulins pliancy poleyns pollens pillions pollinize polonaise paulownias
lanes tolanes planes silanes lianes flanes cleans lance sallowness guylines alines leanness clones fallowness balance lianas gluiness leans jawlines foulness lauans reliance jowliness lowliness villainies plans malines fullness leones valance alans plains lines silliness valines plainness lenes loonies solans hyalines cholines chilliness woolliness wiliness wellness uhlans toluenes valiance colones delaines dailyness paleness xylenes sullenness mellowness lunies clines slyness lowness jolliness dulness violones alienees oiliness fulness hollowness glans baloneys reloans vileness callans felines blennies felonies millines lunes illness colonies bylines lawns loans clans beelines boloneys elains alienness holiness maleness coolness kaolines callowness oleines glance relines hilliness mealiness bowlines lioness cleanness lallans villainess llanos ballonnes kalians blueness solanos villains alliance salines realness looneys juliennes haleness elans gleans glueyness flans blains cleanse fellness soleness slowness xylans dailiness dalliance dullness tallness tolans towlines ulans wholeness wooliness chalones chillness shallowness yulans