General:
* Splendor: This emphasizes the impressive and awe-inspiring quality of something majestic.
* Grandeur: This highlights the size, scope, and power of something majestic.
* Magnificence: This focuses on the beauty and wonder of something majestic.
* Sublimity: This emphasizes the elevated and transcendent quality of something majestic.
Specific:
* Majesty: This is the most direct noun equivalent, but it can be formal and sometimes feels a bit too literal.
* Awe: This captures the feeling of being overwhelmed by something majestic.
* Wonder: This highlights the sense of amazement and curiosity that something majestic evokes.
Ultimately, the best noun to use will depend on the specific context and the particular aspect of "majestic" you want to emphasize.