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.
sevens savins suaveness sphenes safeness saphenas savannas saphenous savannahs savines siphons syphons
avens livens davens sevens ravens heavens givens wovens dovens ovens covens mavens leavens evens havens mayvins savins fens deafens faenas sphenes hyphens veenas deveins vans foehns toughens divans pavans covins levins hryvnas mavins pavins caffeins offense veins defense ravins saphenas novenas venus devons roughens