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.
wrench ranch rancho raunch raunchy
bench quench tench wrench kench wench pinch lynch raunchy rancho mensh launch bunchy eunuch ancho punchy paunchy painch finch dunch cinch chinch poncho winch bunch ranch paunch concha concho conchy honcho conch haunch manche lunch punch munch raunch cancha inch hunch synch chinchy
wren rein renew arena arene bren erenow frena warn worn