Correct Answer: omnipotent

Solution : The first option is correct.

Explanation:
The term omnipotent is the most suitable one-word substitute for one who is all-powerful. It specifically conveys the idea of possessing unlimited or universal power, often associated with a deity or a supreme being.
The meanings of the other options are as follows:

• Conqueror: One who conquers or defeats others, typically in the context of warfare or competition.
• Emperor: A ruler of an empire, a person with supreme authority over a vast territory.
• Sovereign: A supreme ruler or monarch, possessing autonomous power and authority over a territory or state.

Therefore, the correct answer is omnipotent .