Synonyms for Colossus:

n.

leviathan, beanpole, gamine, mannikin, brute, amazon, he-man, manikin. colossus (noun)
goliath, behemoth, giant, titan, heavyweight, monster.
giant thing (noun)
giant, leviathan, titan, behemoth, goliath.
titan (noun)
titan.

Other synonyms:

he-man, beanpole, gamine, amazon, leviathan.