Employee
He is an authority in his field.
Lord
It means to formally relinquish power or authority, as when a monarch abdicates. It also means "surrender".It means to relinquish or give up your position or responsibilities.
power or authority to do something
Rule, power, sway, control, influence. Btw, I believe you mean synonym. Homophone in a word that's spelled the same or similar, but means something different. Synonym means the same thing, but is a whole different word. There is no actual homophone for authority.
The word authority means a legal format of doing thing or the decision making.
"Entrenched" means firmly established and difficult to change, typically referring to beliefs, practices, or systems that have been in place for a long time. It can also imply being deeply ingrained or well-established within a particular context.
The term "installed" is especially relevant to equipment or machinery, by placing or fixing. It also means to place someone in a new position of authority.
authority
Yes, the noun 'authority' is an abstract noun; a word for the right to give commands; the power to influence the behavior of others; that is used to support a position or decision; the quality of being convincing; a word for a concept.
seized
In Maori culture, "mana" refers to spiritual power, authority, or prestige. It is the belief in a supernatural force that can empower individuals or objects.