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.
notify nidify native
beatify beautify notify ratify citify deify tiff tivy edify caitiff codify modify motif nidify reedify stiff
not knot knotty nodi nota note nowt anti inti snot snotty untie