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.
river reiver riever riviere riviera rover rifer raver reaver revere revery reverie reifier reefier refer refry reefer refire roofer referee reoffer rougher
aiver shiver siver giver naiver jiver liver quiver river fiver diver reiver wiver waiver caver raver never aver heavier ever beaver leaver revery heaver lifer riever veer lover laver miffier reifier every vier quavery soever shivery chaffier whoever weaver wavery knifer deifier daffier shaver lever very buffier liever louver fifer beefier vera livery puffier paver cover livre mover knavery haver fever hoover rover reefier iffier quaver jivier leafier laveer fiery rifer heifer huffier levier savvier livier severe leavier revere over riviera bouvier newwaver quivery goofier saver suaver sever defier riviere waver wavier weever hover chuffier reaver shover
rive rave reive rife rove brief grief grieve privy driegh drive trivia