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.
sugh saugh sough saughy sigh soph syph sophy suave
faugh vugh cough kiaugh laugh lough pugh rough saugh sough sugh teugh tough ugh waugh