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.
topis tops topos tipis tapis topes topees toupees taps tups tawpies tips toepiece tipsy typos dopes tapas dopas tepas topaz types tapes typps taupes tepees tepoys teapoys teepees daps dips dups
topis ops pis loops copse whoopies piso kops coops poops tops pappies pies poise piss pias hoops mopes lops bops pois biopsy poppies yippies popsy chops cheapies soaps wops whops tapis oops hyssops ropes goops soups guppies dopas tipis knops lapis copies cops capias buppies hopes hops whoops coups loups fops puppies nappies topos kewpies mops kepis lopes cowpies opes shops roups chappies topes tawpies dopes spies sops sepias copes pops chippies popes pips opus koppies hippies weepies woops yuppies
topi top tipi tope topee topo topoi toupee atop atopy stop stope utopia