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.
forties fortis fortes forts ferities frites fordoes frats ferrites ferrates frits phorates foredoes fords frets farts verities varieties fiords fritts fruits ferrets fretsaw virtues verites variates faradize faradise verts fards fritz farads frauds vertus virtus veritas viroids
forties parties sorties shorties hearties dirties aretes writes frites pirates derides berates gyrates ferities parities cerites neuritis rewrites borates varieties orates serrates birdies grides rites purities borides carates charities urates tortes hydrides rates grates barites reties crates pretties courtesy yperites curites deaerates ferrites quartes mortice narrates norites irides ferrates garotes cartes rotis prides verites sureties curates verities rides brutes joyrides barytes virtues cowrites hayrides fortes diorites iritis hardies aerates brides phorates burdies rotes bourrides mortise prates gratis karates hurdies rarities curtesy pyrites certes marrieds sorites garrotes derates hydrates tardies cerates treaties weirdies fortis