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.
clutter cluttery clouter clatter clattery colter glitter coulter glittery cloudier colluder kilter colder kelter culture caldera cloture clowder gloater quilter cloddier collator collider guiltier coleader gleetier gauleiter glider golder kultur gladder gladier guilder
flutter clutter blatter letter allotter lottery lotter littery vaulter blotter litter coulter glittery platter plottier poulter saluter slittier sluttier blottier latter flattery cluttery flouter fluter flutier fluttery clatter clouter flitter clattery flatter glitter moulter plotter polluter reletter slitter slotter diluter