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.
papains pepinos pippins pipiness peppiness
papains pains pans pins peins pepinos pinas rapines peans repins pawns lupins opines spawns panes spines supines teopans chopines sapiens pansy pions spans japans pippins lapins repines lipins cioppinos lupines pines pians speans kneepans spins taipans tiepins chopins