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.
parasite parsed prosit prussiate preside pursuit prostie praised porosity prest prost periostea parricide praesidia preset purist prized priest prosed pursed presto priced purest prised prosciutto prosciutti peracid poorest pressed prissed pursued perused presidia presidio hyperacid
parasite resite boracite jarosite prussiate cerusite cerussite
paras pars spars proas prays praus prase praos pears praise parse parrs paris pariahs pares pairs sparse