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.
slitter slittier slotter sluttier slater salter slider saltier soldier siltier slatier solider saluter sleetier soldiery solitary solitaire solder sultry saltire sledder salutary solidary zoolater
litter glitter flitter slitter reletter fluttery plotter blatter lottery milter cluttery plottier sluttier slittier kilter flattery flatter filter blottier blotter allotter plaiter jilter platter philter flutter lotter liter politer clutter letter slotter loiter littery latter clatter gauleiter clattery glittery quilter tilter