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.
pensee pens peens peans penes pence peons penis peins paeons paeans pennis peones pennies peonies pawnees pons pans pins puns poons pinas punas pians panes pains pines pones pawns pansy pions pannes pianos pinnas ponies pinnies hyponeas
pensee guanase sense cense rennase nose mensae nonuse lionise mannose linsey lense lanose kinase donsie donees townees sonsie ionise knees manse dense sensei sansei rinse ranees mense pawnees hanse anise ansae ensue fiancee venose tense donnees unsew
pen pean peen pein penna pennae penne penni pennia penny peon peony open