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.
aghas aphis aves avos
aghas coughs weighs toughs sughs sighs roughs phase ephahs ephas vughs highs ghis quaighs kiaughs laighs laughs loughs neighs nighs raphias saughs soughs diphase ughs yoghs