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.
gooky gook kooky cooky cookey kook gogo coky cook gowk gawky cocky kookie cookie caky cock coco coke gawk guck
cooky rooky nooky gooky hooky kooky hook book rocky sook pokey nook jokey cocky took look okay gooey chook chokey choky kook tokay hooka coky cookey rook gook poky oaky joky cooey hookey hokey pocky cook shook
gooky gook goo sook rookie nooky nook kooky kook hookah gogo cooky cookie cookey cook hookey hooky gowk hooka kookie hook look bookoo nookie bookie rook book rooky gooey took