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.
coughs kiaughs quaighs coffs coifs coofs coves cuffs caphs kophs qophs cuifs coiffeuse coveys cuvees coffees coiffes
vughs sughs coughs saughs laughs loughs ughs kiaughs roughs soughs toughs highs weighs quaighs ghis laighs aghas sighs ouphs nighs neighs yoghs