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.
piranas puranas pirns pyrans prawns paranoias paranoeas parians pyranose porns pornos prunes preens purins prance prions prunus pereons purines perrons pyrenes pyrones hyperons pereions poorness pruinose pureness prince
guaranas puranas piranas trans serranos durians marinas sarans currans grans brawns brans burans terranes uranias korunas ranis coronas furanes hernias carinas harianas varnas furans rains brains groans cranes parians jarinas corneas farinas murrains prawns arenas ruanas grains roans boranes guaranis lorans marranos pyrans saurians drains terrains trains tronas shorans
pirana pirn paranoea paranoia prawn purana pyran