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.
fraena frena furan farina furane foreign fern firn ferny frown varna ferine
fraena ruana arena frena varna hariana crania grana guarana pirana purana urania
frae faerie faery fare fere fire fora foray fore fray free froe raver