What term describes a person who is excessively greedy or eager for food?

The term that describes a person who is excessively greedy or eager for food is "voracious." This word originates from the Latin "vorax," meaning "devouring," and is commonly used to convey an insatiable appetite for food. A voracious eater enjoys consuming large quantities of food, often with great enthusiasm.

In contrast, "vivacious" refers to a lively and animated personality, typically associated with someone who is full of energy and spirit, rather than their eating habits. "Viable" pertains to something that is capable of working successfully or feasibly and does not have any connection to appetite or food. "Vex" means to annoy or disturb, rather than describing a person's relationship with food. Therefore, "voracious" is the most appropriate term for someone characterized by greediness or eagerness regarding food.