What are the different bodies Master Masons can join?

Master Masons seeking further light beyond the symbolic degrees have access to a wide range of additional degrees and concordant orders, sometimes referred to within the fraternity as "Side Degrees", as an article on the Grand Lodge of India's website notes.

The Holy Royal Arch is presented as the completion of Craft Masonry and the traditional next step, open to a Master Mason four weeks after being raised, as the Grand Lodge of India states. Beyond the Royal Arch, the degrees and companion orders available include Mark Masonry, Royal Ark Mariners, Rose Croix within the Ancient and Accepted Rite, Knights Templar, and the Royal Order of Scotland, as the United Grand Lodge of England states.

In Cryptic Masonry, Councils confer the degrees of Royal Master and Select Master—often accompanied by the Super-Excellent Master degree—to elucidate parts of the Royal Arch rite 12. In American Templarism, governance rests with a Grand Encampment overseeing Grand Commanderies, which confer chivalric degrees including the Knights of the Red Cross, Knights Templar, and Knights of Malta 13.

In the Ancient and Accepted Scottish Rite, additional degrees up to the 33rd Degree are governed by Supreme Councils, using bodies such as Consistories to confer higher grades 1. Entry to the Christian Rose Croix degree under the Supreme Council requires a brother to have been a Master Mason for at least a year 2.

Under the Allied Masonic Degrees, worked rites include St Lawrence the Martyr, Knight of Constantinople, Red Cross of Babylon, Grand Tylers of King Solomon, Secret Monitor, and Grand High Priest 21. Additional bodies open to Master Masons include the Rosicrucian Society, which functions as a study organization requiring Master Mason status to enter as a Zelator 2, chivalric bodies such as the Red Cross of Constantine and the Royal Arch Knight Templar Priest 2, and trade-specific groups such as the Universal Craftsmen Council of Engineers 1.