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.
slacker slaker slicker sulker silkier sleeker sulkier slaggier sleekier slogger slugger
lacker blacker slacker clacker walker flickery slicker clocker laker luckier lakier leaker leakier licker locker flockier bleaker balker flaker flicker clicker blockier colickier flackery pluckier flakier plucker slaker calker talker blocker shlockier