Modifiers matching giant:

• past,
• local,
• commercial,
• jurassic,
• migratory,
• industrial,
• respected,
• armored,
• transnational,
• prehistoric,
• extinct,
• flying,
• marine,
• corporate,

Simple categories matching prehistoric:

• site,
• mammal,
• artefact,
• animal,
• dinosaur,
• giant,
• survivor,
• reptile,
• organism,
• tool,
• critter,
• creature,
• artifact,
• material,
• beast,
• monument,
• relic,
• item,