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.
dopas dopes dups tops dips daps diapause topis deeps dupes tapas topaz topes topos tepas depose topees toupees taps tips tups
dopas ops pas bypass napas repass capias hoops opahs biopsy cops topis chops cuppas whoops kapas fops tapas bops mops lopes lipase hopes chuppas woops tops topaz pays hops papas paps poops poppas ropes koppas loups hyssops soaps soups spas nipas copays popsy pase kops spaes nappas huppahs pias peas goops oops pass mopes repays cowpeas dopes lops copse coops coups paws loops roups knops sepias copes spays popes sops opus papaws pupas kappas pops pawpaws topes topos upas opes whops wops tepas chuppahs shops