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.
simian saimin soman seaman semina simony simoon semen seamen summon someone symbion zoomania
simian man mina lawman semina mien gamine jiminy leman jimminy saimin camion soman amain cowman cummin bayman bemoan amino famine hemin mini diamin showman woman moan toman domino numina domain limina romano damiana amin lumina human mine immane reman vimina imine ammino humane ammine bowman bemean cayman main mean gamin haemin cumin caiman liman imino lamina mana amnia rumina layman foeman hominy mano maun lomein roman mawn amine remain daman mane seaman diamine many domine tamein nomina wimmin shaman demean yeoman