A 'hypochondriac' is someone who is excessively worried about their health.

A 'nitpicker' is someone who is overly concerned with minor details.

'Negotiator' is the term for someone adept at negotiating agreements.

A rhetorician is specifically skilled in the art of rhetoric and persuasion.

An 'astronomer' is a person who studies celestial bodies.

Advocacy refers to the act of supporting or recommending a cause.

A 'soliloquy' is the act of speaking one's thoughts aloud when alone.

Clarify means to make a statement or situation less confused and more comprehensible.

Mitigate means to lessen the severity or intensity of something.

Aggravate means to make a problem or situation worse.

Obfuscate means to deliberately make something unclear or difficult to understand.

Mumble means to speak in a way that is unclear or difficult to understand.