noun

an imaginary or mythical being of human form but superhuman size.

colossus,man mountain,behemoth,Brobdingnagian,mammoth,leviathan,monster,monstrosity,ogre,jumbo

adjective

of very great size or force; gigantic.

giant multinational corporations

huge,colossal,massive,enormous,gigantic,very big,very large,great,mammoth,vast,immense,tremendous,mighty,stupendous,monumental,epic,prodigious,mountainous,monstrous,titanic,towering,elephantine,king-sized,king-size,gargantuan,Herculean,Brobdingnagian,substantial,extensive,hefty,bulky,weighty,heavy,gross,mega,monster,whopping,whopping great,thumping,thumping great,humongous,jumbo,hulking,bumper,astronomical,astronomic,whacking,whacking great,ginormous