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.
rental riantly rondel roundel roundly rondelle
fontal dental mental quantal quintal cental rental cantal genital poundal gentle lentil quaintly hantle faintly gentil vandal lintol mantel mantle riantly notal pontil auntly until ventail saintly jointly lanital gently fantail natal sendal pentyl entail ponytail sandal santol pintle gauntly cantle pintail cantala lintel dentil neonatal wintle
rente rent rant reendow reined rend rennet reunite runt runty arenite brent crenate grenade trend trendy