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.
cuatro cater cuter coater quatre couter cutter couture cattery cattier cautery catarrh gater gator cadre gutter cottar cooter guitar gaiter cotter quoter coterie cottier goutier guttery guttier quieter quitter quittor
cuatro taro oater neater mater gater quatre toro trio trow coater troy tyro stroy seater tatar retro water pater beater boater hater nitro metro later tiro gator hetero heater cater eater viator feater strow satyr dater rater tater outrow cheater
cut cat scuta scatty scat acute acuate quate cutty cutie cutey cute couteau coati coatee coat catty cattie cate cacti scatt scut scute