Select the most appropriate one-word substitution for the given group of words. 

One whose eating habit is repulsive 

Glutton

The most appropriate one-word substitution for "one whose eating habit is repulsive" is glutton.

• Obese means very fat.
• Piscivorous means eating fish.
• Connoisseur means an expert in or connoisseur of fine food and drink.

The word glutton comes from the Latin word "gluttire," meaning "to gulp down." A glutton is a person who eats too much, especially in a way that is considered greedy or disgusting. Gluttons often have a voracious appetite and may eat even when they are not hungry.