Define:
Hominid -
Hominin -
Primate -
Hominid refers to any member of the biological family Hominidae, which includes modern humans, chimpanzees, gorillas, and orangutans.
Hominin refers to any member of the tribe Hominini, which includes modern humans and their ancestors after the split from the chimpanzees.
Primate refers to any member of the order Primates, which includes humans, apes, monkeys, and prosimians (lemurs, tarsiers, etc.), characterized by having large brains, forward-facing eyes, grasping hands and feet, and social behavior.