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.
verset verst verste versed verist veriest varsity frisette veracity fieriest frost first frosty forest frowst freest frusta farside phrased fairest frowsty forestay virusoid furriest frizette ferocity foreside firriest fireside feracity voracity
verset worset corset first cursed russet cruset verst versed frost hearsed worst wrist burst barest aurist arrest aorist reseat cresset dourest sheerest wrest preset tryst tourist queerest lyrist nearest parsed durst rarest grist purist searest sorest surest diarist prost erst roset verste hurst rust jurist horste trust crest pursed coursed forest fairest rest drest russety crust verist purest horsed poorest horst dearest sourest serest rearrest curst tercet airest nursed prest merest querist karst reset direst wurst yarest
verse verso vars veeries veers viers avers averse overeasy overissue overs oversaw oversea oversee oversew overuse