A word for a word that's fun to say?

[James Callan]

A colleague asks:

> Is there a word that means “a word, or combination of words, that is fun to
> say” or something similar?  I’m after words or word combos that are fun to
> say, but aren’t necessarily onomonopoetic.  Like “buttafucco” or “garbanzo”
> and “brouhaha.”

I'm stumped. Does such a word exist, or should it be added to the queue of neologisms we need?

 -- James

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