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.
presses peeresses prosses pareses prisses perses prases purses parses prises proses prezes process parises praises precise precess peruses paresis precieuse precis prices prizes prosos pierces pursues pyrosis piracies precious prissies prossies
heiresses seeresses peeresses duresses dresses presses cresses tresses caresses prosses verses harasses reassess erses reuses heresies phereses crosses cuirasses grasses frasses phoresies creeses uraeuses diaereses whereases diureses trasses wrasses prisses karosses greases morasses brasses pareses boreases grosses diereses resees perses brisses creases cereuses foresees trusses ureases drosses chorusses
press pares peres pores prees presa prese preys pries priss prissy pross prossie pyres apres