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.
depress duperies dopers dupers diapers diapirs dippers topiaries tapers tapirs topers tappers tippers toppers
press cypress oppress depress repress suppress guipures pores sprees pyres spires pries peeress preys koupreys prees apres peres pares prese pross spares priss spores presa sprues cypres