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.
porosity prosit prost prosody prosciutti pursuit prostie poorest prosciutto parasite prest prussiate periostea priest purest prosed preset purist preside presidia presidio praesidia parsed priced prised prized pursed
curiosity cariosity morosity porosity serosity torosity ferocity frosty frowsty varsity jarosite prosit
porose pros pores porous pours praos proas prose proso pross prossie prosy prows pyros sporozoa uprose