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.
poetry powdery pottery peter potter pewter petter powter powder pouter pettier pottier peatier poutier pater padder patter pitier putter puttier
retry poetry try tray foetor retro metro notary deray deary tory terry teary derry mattery meter littery troy powdery rotary story stroy deter dieter teeter tetri watery sheeter guttery cautery jittery battery tottery dietary doddery stray datary cattery rudery metre trey buttery peter tetra betray chattery bootery meeter fetor votary nitery gaudery quieter lottery pottery redry eatery shuddery
poet pot pet pooed spot pouty pout potty potto pieta piety petty petto petti peaty peat spotty