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.
tressy tress dressy tres tares tores dress trues tires tries trews truss trees trass treys tyres duress tories drossy tarres terries daresay tarries tars tors tyros trays truce toras torso dries tours trice trows torse tarsi terce trois terse torrs toros troys trios torsi dares tahrs trace tiers dross tears torus dures taros tiros drees trousseau terais triose torous torahs torose dories terras drowsy tierce dairies dearies derries diaries dowries durries terrace yttrias
cressy dressy tressy grassy press tress drossy daresay greasy dress seeress prissy peeress phoresy cress duress brassy creasy resay caress heresy heiress morassy
tare tire tore tree trey true tyre strew