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.
peeks peaks pecks pekes pekoes pecs pegs picks pokes pikes packs peags paiks pikis pikas pocks pucks pukes piques pokeys pokies piggies pacs pics pigs pugs
geeks cheeks seeks peeks keeks reeks weeks leeks checks recks necks cooees hecks becks zeks wreaks leaks ackees pecks akees raggees wekas leks sheiks gecks chickees queues fecks pekes neuks wrecks skees beaks ekes sickees hackees decks kecks teaks muggees dekes peaks rakees yeuks
peek peak peaky peck pecky peke pekoe apeek