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.
penial penal penile penally pineal pinnal punily panel pinnula
finial xenial hymenial denial penial genial menial venial biennial nil veinal zanily phonily vineal renail zoonal final venal annal finale tineal lineal tawnily moonily phonal binal hymeneal penal funnily hymnal vinal snail cannily tenail tinily toenail anil unnail manual tinnily anal pineal noil biannual renal penile canal zonal nala cuneal lienal rainily annual anneal manila hymenal faunal bonnily biennale nounal banal punily senile sunnily nail anile nill pinnal tonal loonily shinily
pen pean peen pein penna pennae penne penni pennia penny peon peony open pepino