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.
firmly formally formal formol formyl formula formulae vermeil vermoulu
firmly termly warmly primly drumly dermal rumbly brambly formal formol trembly roomily creamily formyl grimily grimly grumbly normal primely cormel trimly crumbly dreamily wormil
firm farm fermi form forme formee frame from