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.
kooky kook cooky gooky cookey kookie coky cook gook kicky cocky cookie cuckoo coke kaki coco keck gogo kick caky kike kaka keek
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
kook kookie kooky sook rookie nooky nook hookey gooky gook cooky cookie cookey hooky cook bookoo bookie look book nookie hookah rook hooka rooky hook took