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.
crooks croaks crocks crocs groks carks corks creaks cracks cricks cargos crakes creeks crocus crucks cargoes croquis caracks karaokes cariocas curacaos carracks curacoas crags grogs kirks gregos quarks quirks carcase carcass
rooks brooks crooks groks trokes crocks troaks croaks drouks corks porks karaokes frocks irokos forks burgoos brocks borks rocks dorks taroks trocks works
crook croak croaky croc crock scroggy