For example, "rabbit rabbit" is a phrase to be uttered first thing in the morning on the first day of the month for good luck all month long. The origin of the phrase has to do with rabbits bringing good luck. Directors on set instruct extras to say "rhubarb rhubarb" to one another during a party scene because of its lack of distracting, sharp phonemes. The repetition of the same word creates a new, unexpected, and unrelated meaning.
Would it be related to the term used to describe repeating the same word twice to create a new word? Dancing the can-can (or cancan) has nothing to do with cans though it might be an abbreviated version of scandal-scandal.
Epizeuxis is more like repeating the same word over again for emphasis or vehemence, like 'location location location!' to imply that the success of a business depends on where the shop is located.
Are the above examples different enough to merit distinction and a term of their own or would they be considered examples of epizeuxis?
(Not interested in grammatical repetition of words although the sentence "Buffalo buffalo Buffalo buffalo buffalo Buffalo buffalo," is really fascinating both grammatically and sensically.)