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.
penal penial penally penile pineal pinnal panel punily pinnula
venal hymenal renal lienal penal renail hymenial vinal anal vineal anneal lineal phonal manual nounal finale annal penial phenol cuneal hymnal menial snail zonal denial tineal tonal keenly final queenly venial genial banal enol canal veinal phenyl finial pinnal pineal biennale binal hymeneal nail biennial biannual nala faunal annual xenial zoonal tenail toenail unnail
pen pennia open puna pina peony peon penny penni paean penne pennae penna pein peen pean spean