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.
stope stop stoop stipe stoup stowp stupe steppe step setup situp steep stupa
tope metope biotope stope top tape potpie topee retype dopey stoop metopae netop stowp atopy watape topi type cotype neotype retape biotype stipe etape stop topo stoup atop stupe dope wattape