Modifiers matching human:

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

Simple categories matching extinct:

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