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.
gnarl gnarly narial nearly nurl narrowly knurl nerol knurly neroli neural neurally
gnarl aril dearly pearl parle nearly aryl earl early farl farle harl jarl carl carle carol marl marly gnarly knurl nurl parol pearly yearly
gnar gnarr knar knarry naira nairu narrow nary near genre genro snare unary