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.
whens wheens whenas wens whins weens weans weensy whence whines woeness wans weenies wienies waeness wins wons whinnies wains wanes wines winos winoes wanness winnows
hens hyphens whens ens paeans veins mensa weensy kens lense fohns deans cense dens genes rouens wheens hymens teens peans peins nenes phons genus peons keens yeans lenos hyaenas shins queens chins faenas dienes menus scenes hons lenes penis foehns tens weans venus jeans veenas pens johns beans lenis gens hygienes benes dense means queans scenas zeins hins dinghies bens kenos mense aeons leans fens lens sensa reins huns liens denes paeons peens wrens miens sense penes tense eons wens neons whenas whins teensy sheens shuns weens hyenas yens
when wen wean ween weenie weeny wenny wheen whin whine whiney whinny whiny wienie