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.
colby clubby colobi callboy club globby glib glob
colby lobby looby bellboy bilby blowby flyby callboy globby lullaby slobby tallboy wallaby
col coly cowl coulee cooly coolly coolie cool colly coal collie cole cola coil coaly coala coyly