Grafting plumeria to adenium
Yes, it can be done. Here is an article on how to do it.
Caring for your Plumeria
Plumeria Propagation – Cutting, Rooted or Grafted 
Understanding Plumeria’s Seasonal Cycles 
Why are Plumeria Seedlings so Different? 
Mealy Bugs Plumeria Pests 
Known Plumeria Names
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