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.
gaydar gadder gaudier cadre gater gator gaiter guider guitar catarrh gaudery
gaydar radar cheddary chadar deodar sudary cyder cedary cedar redear midair dare lidar feudary feodary hydro hydra dear deodara cheddar chuddar
gad gaddi gadi gaed gaud gaudy goad egad