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.
purin purine prion purana parian pereion porn perinea pirn prune prawn porny prone preen porno pyran pereon pernio perron pirana pyrene pyrone hyperon paranoea paranoia
purin burin urn rin urine furan train dourine durian serein serine morrion purine groin bruin grain buran burn farina durn wherein saurian bourne shrine chorion briny heroin journo larine marine prion turion mirin murein murrain narine neuron ferine neurine virion durion murrine quern curn marina bourn rain merino terrain brain herein jarina grin morion carrion mourn parian brin rein turn trine terrine taurine drain murine diuron ruin sciurine sarin brine carina chorine churn serin yourn
puri pur pariah peri pour pure puree purr spur spurrey spurry