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.
headier header heder heater heeder hoodier hetaira hetaera hetairai hetaerae hater hider haughtier hatter hetero hitter hootier hatteria hooter hotter hauteur
headier readier beadier leadier shadier rowdier dowdier muddier sadder ladder meatier header beader bawdier woodier faddier madder deader badder lauder nadir padder raider fader adder wadder baiter kneader waiter ruddier weedier tidier needier seedier lader gaudier reedier aider hoodier deedier gaiter wader reader peatier loader leader moodier gadder matier giddier shader shoddier