Nouns

(n)giantany creature of exceptional size
(n)colossus, behemoth, giant, heavyweight, titana person of exceptional importance and reputation
(n)giantan unusually large enterprise“Walton built a retail giant”
(n)giant, hulk, heavyweight, whalea very large person; impressive in size or qualities
(n)giant, goliath, behemoth, monster, colossussomeone that is abnormally large and powerful
(n)giantan imaginary figure of superhuman size and strength; appears in folklore and fairy tales
(n)giant star, gianta very bright star of large diameter and low density (relative to the Sun)

Adjectives

(s)elephantine, gargantuan, giant, jumboof great mass; huge and bulky“a jumbo jet”, “jumbo shrimp”