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.
croaks cracks crocks creaks crooks crakes caracks carks corks crags groks crocs curacoas carracks cariocas cricks creeks crocus cargos crucks carcase carcass cargoes croquis curacaos karaokes grogs kirks gregos quarks quirks
croaks troaks barks rakes wracks rocks crakes crooks arks groks carks corks caracks hayracks marks parks breaks phreaks reracks brooks darks freaks drakes rakis taroks rakus traiks trocks warks charks rooks arracks quarks narks barracks cracks crocks creaks curacoas cariocas carracks irokos larks harks karaokes araks frocks porks brocks sarks forks dorks borks drouks berakes tracks brakes racks wreaks trokes works sharks
croak croaky scraggy carack crack cracky crag craggy crake creaky creak croc crock crook curacao curacoa scrag scroggy