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.
cherub shrub shrubby choirboy
cherub rub rube ruby verb herb herby grub kerb krubi derby drub shrub yerba
cherry cheerio ochry ochrea ochery sherry churr chore chiru chirre chirr chiro cheery cheero cheer char chary charry charro charr chare chorea churro ocher ochre ochreae cheshire