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.
sepsis sepses seapieces spaces spices spazzes species speises spouses spacious specious speisses supposes
apsis sepsis psis dipsos gipsies sepses popsies lapsus lapses gaposis gypsies copses biopsies apses pussies poussies posies dipsas poesies woopses
ceps saps seapiece seeps sepias sepoys sips sops spas sups zeps asps