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.
sleekier sleeker silkier sulkier slaker sulker slacker slicker slaggier slogger slugger
sleekier lakier shlockier whelkier sulkier sleeker pluckier leakier luckier balkier baulkier bleaker leaker flakier bulkier flockier flukier folkier hulkier colickier milkier silkier blockier talkier chalkier yolkier