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