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.
knacker knackery knocker necker nicker nacre nagger naggier nigger
backer whacker packer jacker sacker hacker dacker racker tacker wacker knacker lacker kickier hocker cocker quicker raker quackier wreaker fakery duckier hawker locker icker ickier rockier maker pockier suckier pickier soaker peckier fucker daiker ticker yakker shocker shakier checker whicker mucker waker fakeer muckier quackery tackier nicker dicker luckier wrecker bakery knackery quakier docker gawker kicker rockery faker sicker leaker mockery decker beaker ocker beakier cockier oakier picker quaker bicker lakier saker pecker peakier baker rocker necker knocker leakier pucker puckery weaker pickeer licker sucker mocker laker dickier bucker cakier ducker taker tucker wackier whackier wicker shaker shicker shucker yuckier