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.
trinal tarnal triennial trenail tarnally treenail triennially diurnal trunnel doornail tornillo diurnally terrenely darnel
carinal morainal urinal trinal tarnal trenail carnal peroneal perennial neuronal cranial coronal cornual corneal journal diurnal hernial geranial baronial renal renail perineal preanal doornail treenail triennial vernal
trine tarn tern terne torn train trainee tranny triene triennia triune trona trone turion turn