WordNet sense 1 (a very large person; impressive in size or qualities):

heavyweight, hulk, whale

WordNet sense 2 (someone or something that is abnormally large and powerful):

behemoth, colossus, monster, goliath

WordNet sense 3 (a person of exceptional importance and reputation):

titan

WordNet sense 4 (a very bright star of large diameter and low density (relative to the Sun)):

giant star

WordNet sense 5 (of great mass; huge and bulky):

elephantine, gargantuan, jumbo

WordNet sense 6 (above average in size or number or quantity or magnitude or extent):

big