Solutions Chimp, for one has 4 entries with similar clues

• 3-letter words
• nim... Chimpsky, primate raised as a human in a landmark language acquisition study
• 4-letter words
• apesChimpanzees, gorillas, et al
• toolStick, for a chimpanzee
• 6-letter words
• bonoboAnimal also known as a pygmy chimpanzee