The term 'PART OF THE OLD TESTAMENT' can be solved by the five-letter word 'KINGS'. The Old Testament is a part of the Christian Bible, which is divided into two sections: the Old Testament and the New Testament. The Old Testament contains 39 books, which are divided into four sections: the Pentateuch, Historical Books, Poetical Books, and the Prophets. The book of Kings is part of the Historical Books section, and it is the second book in the section. It is a narrative of the history of Israel from the time of King Saul to the time of King Zedekiah.