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.
prostie prost prosit prosed periostea preside prosciutti parasite porosity prest prussiate priced prised purist parsed preset pursed priest purest prized presto prosciutto proceed pursued pressed perused praised prissed poorest prosody pursuit persuade presidia parricide praesidia peracid pierced precede
prostie horste jarosite creosote crosstie periostea christie
pros porose praos proas prose proso pross prossie prosy prows pyros uprose