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.
fowls foals fouls foils fools flows foleys follis folles folios fallows follies fils vowless folious fellows flus foliose follows fells fails flees false falls flies fulls flaws fleys fills feels flues floes floss viols filos files flews flays voles fuels fleas fellas violas ghouls voiles filles flossy floosy fillos falsie filose failles feeless fellahs felloes fillies floosie flossie volleys fellies ghoulies viewless
bowls howls owls yowls fowls jowls cowls shools foals molls belows hollows noils knolls lowse fools mewls kolas fallows oles boles bolls moles mools sallows aiolis polos blowsy voles polys haoles yellows pawls moolas colas sheols hols shallows cholas willows wawls tools tolls tolas tallows dolls solos diols fellows roles soils bolas mellows reoils oils kolos polis bawls goals bolus solus bolos molas blows joles gallows holes pols coals kohls polls noels rolls koels plows roils ghouls allows cools fouls hallows awls violas lows coles follows cols boils nolos gaols coils flows lolls billows sols foils bellows poles viols mallows pools glows moils slows mols quolls souls soles doles dols toils toles tolus wallows wholes wools cholos shawls shoals yawls pillows
fowl flow foal foil foley folia folio follow folly fool foul foully