Behemoth
Part of speech: noun
Definition: A great and mighty beast described in Job 40:15-24 used to illustrate God's mightiness. A great and mighty monster. Something which has the qualities of great power and might, and monstrous proportions.
Heavyweight
Part of speech: noun
Definition: A very large, heavy or impressive person.The professional boxing weight division for boxers weighing more than 190 pounds; a boxer in that division.A similar division and contestant in other sports.
Part of speech: adjective
Definition: Of the heavyweight boxing (or similar) division.Being relatively heavy.Being a leader in one's field.
Example sentence: As a heavyweight, I've not missed dieting. Those days where you're sore or tired, it makes me feel happy to know I can eat a bar of chocolate.