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.
fleet filet fillet fled flit flat felt float flout fault flued fluyt flite flota filed flyte flute flied fluty valet fooled faulty folate flauta foiled violet fouled fueled felled floaty flutey fealty failed foaled fulled fowled filled fuelled fallout fellate folioed foliate filiate velleity fold volt
fleet leet sleet gleet let sallet gullet bleat billet ballet howlet cleat bolete violet fillet filet culet relet millet mullet palet pellet pleat sleety toilet willet quillet gallet blet owlet mallet galleta valet gleed boleti bullet killdee gleety cullet bleed bluet muleta glede pallet piolet pullet rillet collet callet delete wallet chalet
flee feel file flea flew fley floe flue foley level levelly