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.
tryst tryste trust trusty triste truest turista tourist trustee tarriest touristy teariest tourista durst drest direst driest tercet dearest diarist dourest torsade tressed trussed torosity
tryst rest lyrist prest nearest purest grist queerest crust searest rarest sorest hurst corset verst surest diarist horst dourest frost durst forest trust verist tryste fairest worst erst sheerest first barest rust dearest airest merest prost poorest purist karst querist curst serest rearrest sourest jurist crest aurist verste direst horste drest wrest tourist wrist burst verset worset aorist wurst arrest yarest
drys tars tarsi terse tors torse torsi torso trass trays tres tress tressy treys troys truss