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.
attar attire atria auteur
attar cottar ottar tar vetter tuatara phatter fitter getter gutter cutter nutter lotter titter mutter quittor hotter bitter bettor hatter tatter dotter netter otter shutter petter chitter whitter ritter wheatear watter fatter letter retear putter sitter rotter knotter setter star datary stare butter quitter tare tahr jitter fetter hitter taro tetter totter dietary latter litter batter knitter matter natter jotter notary tatar votary guitar stair satara better rotary sitar potter ratter cotter tear utter wetter reutter whetter chatter patter shatter yatter