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.
crucks cracks cricks crocks caracks corks carks crocs carracks crooks creaks creeks croaks crocus crakes carcass croquis carcase crux curacoas curacaos cariocas crags groks kirks cargos quarks quirks cargoes garigues karaokes
rucks crucks trucks reracks frocks bricks brocks tricksy tracks drecks perukes wricks hayracks barracks cricks crocks cracks caracks lurks racks hayricks pricks verrucas wrecks trocks tricks drouks derricks murks wracks arracks carracks recks ricks rocks ruckus turks
cruck crack cracky crick crickey croc crock