General:
* Monarch: A sovereign ruler, especially a king or queen.
* Patriarch: The male head of a family or tribe.
* Oligarch: A member of a small, powerful group of people who control a country, organization, or industry.
* Hierarchy: A system in which people or things are ranked according to status or authority.
* Anarch: A person who believes in or advocates for anarchy.
* Polyarch: A system of government with multiple rulers.
* Monarchist: A supporter of monarchy.
* Oligarchist: A supporter of oligarchy.
More Specific:
* Architect: A person who designs buildings.
* Bioarchaeologist: An archaeologist who studies human remains.
* Bibliarch: A person in charge of a library.
* Gymnarch: A type of fish.
* Laryngarch: A person who is an expert in the larynx.
* Neurarch: A person who is an expert in neurology.
* Zooarch: A person who is an expert in zoology.
Figurative/Literary:
* Archangel: A powerful angel, especially one of the highest rank.
* Arch-enemy: A person's main enemy or rival.
* Arch-villain: The main antagonist in a story.
Note: The suffix "-arch" is often associated with leadership or authority, but it can also indicate expertise in a specific field.