glutton; ravenous eater
A person who eats excessively or greedily; often carries a negative or critical tone.
He is a glutton; he polished off three whole pizzas by himself.
食いしん坊 is a more casual, often affectionate term for someone who loves to eat, whereas 暴食家 is more formal and critical.
Compound of 暴食 (boushoku, 'gluttony, overeating') and 家 (ka, 'person, specialist'). The exact historical derivation is uncertain, but the word follows a common pattern for labeling a person by their characteristic behavior.