However, "cockadoodledoo" is a sound made by a rooster and doesn't have a direct connection to a roster (a list of names).
Could you please clarify what you are looking for?
For example, you could ask:
* "How do you spell the word for a list of names?" (Answer: roster)
* "What is the correct spelling of 'cock-a-doodle-doo'?" (Answer: cock-a-doodle-doo)
Once you provide more context, I can help you with the spelling.