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.
truism tourism triseme trisome trisomy tiresome dorsum
truism verism verismo heroism lyrism porism prism purism tourism charism charisma chrism chrisma chrisom
tories torus trice tries trios triose trois trousseau truce trues truss