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We often here people calling Assassins by some form of title within the SL Gor world. Some Assassins call other Killers, Brother some Killer. below are book supported terms that "could" be employed by Role-players who seek a certain degree of accuracy according Normans descriptions.

Killer

Welcome, Killer," said the man, addressing the Assassin by what, for that caste, is a title of respect.”
Assassin of Gor, Chapter 2

Brethren

I had seen nothing of the officer of Treve this morning. He had, I gathered, thought it best toavoid the depths this day. Indeed, the guards of the pits had been dismissed. "We have no need of them," had said the leader of the helmeted, darkly clad brethren.
Witness Of Gor Chapter 31

Confederate

"Perhaps a confederate in the andience will strike me when my back is turned?" I suggested.
The face of Drusus showed no emotion.
Beasts Of Gor

"The assailant and his confederates?" I asked.
"They are in a separate chain of command," said the merchant, 
"one emanating from the ships, one to which Zarendargar is subordinate."
"I see," I said.
Beast of Gor - Page 105

I saw another man, too, in the darkness. The heels of both hands drove upward and the head of the first confederate snapped back. The garrote was loose about my neck. I turned. The first man had fled, and the other with him.
Beast of Gor - Page 102

Assassin Trainees - Candidates/Lads

Candidates for the caste are chosen with great care, and only one in ten, it is said, completes the course of instruction to the satisfaction of the caste masters.

The assassins take in lads who are perhaps characterized by little but unusual swiftness, and cunning, and strength and skill, and perhaps a selfishness and greed, and, in time, transform this raw material into efficient, proud, merciless men, practitioners of a dark trade, men loyal to secret codes the content of which is something at which most men dare not guess.
Beast of Gor - Page 409

Sleen of the North

"He is white, " said a man nearby. "Only those in Schendi might hire such a killer. They are familiar with the sleen of the north."
Explorers of Gor, p.241