@daverod,
The word 'Satan' is first mentioned in 1 Chronicles 21:1 "And Satan stood up against Israel, and provoked David to number Israel.
21:2 And David said to Joab and to the rulers of the people, Go, number Israel from Beersheba even to Dan; and bring the number of them to me, that I may know it."
The word 'devil' is first mentioned in Matthew 4:1 "Then was Jesus led up of the Spirit into the wilderness to be tempted of the devil."
The word 'serpent' is first mentioned in Genesis 3:1 "Now the serpent was more subtil than any beast of the field which the LORD God had made. And he said unto the woman, Yea, hath God said, Ye shall not eat of every tree of the garden?"
The word 'dragon' is first mentioned in Nehemiah 2:13 "And I went out by night by the gate of the valley, even before the dragon well, and to the dung port, and viewed the walls of Jerusalem, which were broken down, and the gates thereof were consumed with fire."
The word 'Lucifer' is first mentioned in Isaiah 14:12 "How art thou fallen from heaven, O Lucifer, son of the morning! how art thou cut down to the ground, which didst weaken the nations!"
The words 'dragon', 'serpent', 'Devil', 'Satan' is all mentioned in Revelation 12:9 "And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him."