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.
casease caseose casas cases causes caseous cassias causeys casus gases coses cusses cosies gasses coseys cassis cuisses gaseous gausses quasses quassias cussos gooses guises kisses guesses gussies
casease misease disease seas feases teases caseose diseuse cease seise eases rousseaus nauseas reseaus ceases decease leases peases disseise masseuse wiseass