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.
joker jokier jacker jogger jackeroo jagger jigger geekier jaggery jaggier jiggier jagghery
booker toker hooker poker looker joker cooker choker quackery gawker quackier baker kookier peakier okra gawkier leakier kickier muckier packer cookery pawkier jokier hocker picker reeker kier dickier mocker skier icker keir sucker pokier saker pecker racker necker pockier pickeer reekier tacker yuckier shucker shikker shakier chukker piker checker whicker whacker waker wacker licker wrecker taker duckier jacker hacker cocker biker rocker bucker rookier rockier sicker decker knocker beakier dacker oakier goer docker lacker luckier quicker gooier bakery cockier quaker wreaker mockery hookier cooer nicker raker siker faker sacker lakier pickier bicker liker knacker peckier backer hokier meeker leaker cakier fucker tackier hawker maker fakery mucker hiker pucker suckier fakeer quakier kicker locker puckery geekier ocker rockery duiker ticker beaker seeker rookery laker ickier daiker soaker dicker diker ducker knackery tucker wackier weaker whackier wicker cheekier chokier shaker shicker shocker yakker yukkier
joke jokey jake jock jockey jocko joky jouk juke