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.
pence penes ponce pounce pensee peones panacea pinnace pennies peonies pens peons peins penis peans peens paeans paeons pennis pawnees pans pins pons puns
faience science hence pence whence fence jounce once fiancee launce nonce cense nuance bounce mense hygienes genes gynaecea quince ounce sense dance dense dunce tense wince chance benes wincey lense jaunce hance nice lance lenes menace fiance nance mince pounce pinnace nenes penes ponce seance since denes dienes tenace rance niece scenes yince
pen pean peen pein penna pennae penne penni pennia penny peon peony open