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.
prawns pyrans parians puranas piranas pirns porns pyranose prance prunes preens prunus purins prions paranoeas paranoias pornos pereons purines perrons pyrenes pyrones hyperons pereions poorness pruinose pureness prince
brawns prawns parians birianis piranas murrains lorans karns barns grans guaranas currans cranes roans ranis ruanas puranas reearns saurians darns drowns tarns terranes trans sharns yarns harianas boranes marranos groans brains browns burans earns frowns furanes brans furans carns crowns grains guaranis learns rains pyrans sarans serranos drains durians terrains trains warns shorans yearns
prawn paranoea paranoia pirana purana pyran sprain