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.
pennon pennine pinon panino pinion panini pinene
cannon pennon none nona neon canon guenon quinone noon ninon minion noun onion pinion rennin reunion xenon tenon wanion panino known munnion gunnen anon bunion fanion fanon phonon inion annona gonion ionone mannan anion pinon renown ronion tannin union chinone
pennae penni pennia penny penna penne pen pein punny panne peen pinnae peon pean pinna pinny peony open