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.
carton cartoon cartoony croton craton cardon crouton carotin cardoon carrotin carotene cretonne cortin cretin cordon cortina curtain quartan creatin creatine cowritten garden gratin gratine greaten grutten guerdon keratin gardenia gratinee guardian gueridon
burton carton parton martin ratton ratoon croton guerdon lardon baritone partan marten proton torten triton chorten rattoon rhyton baryton quartan cardon cartoon cordon cortin craton crouton bourdon hearten tartan pardon tortoni barytone tritone shorten
carte cart scarred ecarte acarid curt crate carroty carrot carried caried caret cardio cared cardiae cardia card carate carat caird crit kart acaroid scared scart