The term 'son of ___' can be filled in with three different answers: GOD (3 letters), SAM (3 letters), and AGUN (4 letters). The first answer, GOD, refers to the Christian belief that Jesus was the son of GOD. The second answer, SAM, is a reference to the biblical figure Samson, who was the son of Manoah. The third answer, AGUN, is a Hebrew term meaning 'ANCHOR, ' which is used to refer to a woman whose husband has disappeared or is missing and is unable to grant her a divorce.