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.
papain pepino pippin
pain papain pan pin japan pepino lapin rapine lipin rappini lupine repine opine piny pion spean spine supine teopan chopin span cioppino apian pane lupin pina kneepan pippin pine rapini pawn pein repin pian pean spawn spin spiny taipan tiepin chopine
papa papaw pap pappi pappy pawpaw