Modifiers matching giant:

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

Simple categories matching extinct:

• ratite,
• animal,
• human,
• mammal,
• beast,
• fauna,
• relative,
• organism,
• vertebrate,
• herbivore,
• dinosaur,
• predator,
• creature,
• giant,
• bird,
• plant,
• amniote,
• equid,
• reptile,
• archosaur,