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.
toenail tenail tonal tenaille tonally denial tineal tinily tawnily tinnily tunnel
renail toenail tenail nail menial hymenial denial snail renal penile penial penal lienal senile genial venial venal veinal hymeneal hymenal xenial unnail nil