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.
frena fraena farina fern firn foreign ferny frown furan varna ferine furane
arena frena herein hereon hernia gyrene jarina carina varna cornua grana moreen krona pereon preen pyrene serene syren terrene trona warren whereon guarana fraena farina marina boreen barren arene wren rein careen bren cornea corona koruna green murein pirana purana serein siren terreen treen tureen wherein chirren
fare fere fire fore frae free froe