Modifiers matching human:

• extinct,
• fossil,
• primitive,
• ancient,
• modern,
• carnivorous,

Simple categories matching extinct:

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