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.
laighs laughs loughs loofahs lavs lavas laves leafs levis lives loafs leaves levies loaves loofas luffas
quaighs nighs weighs laighs highs sighs neighs coughs saughs ughs kiaughs sughs ghis soughs roughs laughs aghas loughs toughs vughs yoghs