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.
verst verist verset verste veriest versed varsity veracity fieriest frost first frusta freest frowst forest frosty fairest frowsty feracity ferocity firriest forestay furriest virusoid voracity
erst verst forest horste aurist veriest barghest prest wrist aorist breast merriest firriest eeriest verist priest verset airiest mooriest arrest barest purest hoariest fairest jurist verste truest sheerest teariest charriest wurst searest worset weariest crest tryst sourest lyrist rarest durst leariest direst drest curst dearest poorest sorest queerest grist frost burst fieriest hairiest prost reset resit miriest rust wrest presto wriest freest hurst merest airest rest aeriest preset burriest resat furriest horst beeriest first reest goriest purist karst serest nearest surest crust dourest diarist querist driest leeriest tourist sorriest trust corset wariest wiriest rearrest worst chariest tarriest cheeriest yarest
verse verso vars veeries veers viers avers averse overeasy overissue overs oversaw oversea oversee oversew overuse