The term KIN OF KONG can be solved by the crossword solution APES, which is a four-letter word. APES are a group of primates that include gorillas, chimpanzees, orangutans, and gibbons. They are closely related to humans and share many physical characteristics. APES are also known for their intelligence and ability to learn complex behaviors. In popular culture, King Kong is an iconic giant ape character that has been featured in numerous films and books. Therefore, the term KIN OF KONG can be interpreted as referring to APES, which are the closest relatives of King Kong.