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.
guitar goitre guider goiter gutter gaiter guttery quieter quittor gaudier goutier guttier quitter kiter gater cuter gator gadder gaydar cottar quatre couter cutter cuatro quoter catarrh cautery couture gaudery
guitar sitar tar dietary titer stare suitor notary nitre stair citer cottar writer wheatear satara retear mitre gaiter loiter liter kiter goitre goiter tuatara biter votary taro rotary tahr litre baiter ottar nitro niter miter tear lidar tare attar diary star suiter datary tatar titre waiter whiter
gut gait gout gouty guid guide gutta guttae gutty quit quite