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.
penna pennae pennia penni pinna penne penny pen pinnae pein peon puna pean pina peen paeon punny panne paean peony pinny pan pun pin hyponea hyponoia poon pain pian pawn pine pony pone pion piny pane puny
henna duenna senna sienna penna penny genoa genua jenny canna fenny benni pinna zinnia scena veena vena sunnah penni tenia hyaena pennia sunna pennae anna benne hymenia nona faena manna biennia venae penne goanna pinnae xenia donna benny taenia wenny hyena