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.
dadaist deadest deediest didst dowdiest dotiest tidiest dottiest duettist tattiest tattooist doughtiest detest tautest
dadaist headiest shadiest weediest dowdiest deediest seediest ruddiest reediest odist neediest beadiest faddiest faddist feudist fideist deist giddiest readiest woodiest tidiest didst bawdiest sadist rowdiest nudist hoodiest muddiest moodiest modiste leadiest gaudiest judoist shoddiest