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.
iritis irids irides irades
iritis neuritis quirts caritas grits crits brits britts burritos gratis bruits forties ferities ferrites fritts frites merits airts barites reties parities peritus purities yperites rewrites sorites sureties dirties droits traits treatise chariots shirts hearties varieties rotis cowrites curites griots heriots raitas writs verities rites fortis riots fruits frits veritas writes verites kraits lariats sorties charities worrits treaties territs dirts diorites cerites girts rarities pyrites pretties parties norites mortise shorties