The term "Royal Armament Research and Development Establishment" is quite a mouthful, and understandably so. However, there are a few synonyms one could use in its place. For instance, one could simply say "RA R&D establishment" or "Royal Armament R&D," which is easier on the tongue. Another alternative is just "Armament Research and Development" or "AR&D." Finally, one could say "Defense Technology Center" or "DTC," which has a similar meaning and is easier to remember. Regardless of which synonym is used, it's clear that the focus is on developing top-of-the-line armaments and technology for defense purposes.