* νικητής (nikētēs): This translates more literally to "victor" or "winner," and would be suitable if the conquest was achieved through battle.
* κατακτητής (kataktētēs): This word means "conqueror" or "subjugator," implying a more forceful and complete taking of control. This is probably the closest single-word equivalent.
* δαμαστής (damastēs): This word signifies a "tamer" or "subduer," suggesting a conquest achieved through controlling or overpowering an opponent.
The most appropriate word would depend on the specific nuance you want to convey. For a general sense of "conqueror," κατακτητής (kataktētēs) is the safest bet.