Devil – An evil spirit; Accuser; Slanderer.
God used this word 117 times in Scripture: 4 times to Israel in the Masoretic Text Old Testament; 84 times to Israel in the Koine Greek Old Testament, 11 times to the Body of Christ in the Dispensation of Grace; and 18 times to Israel’s Little Flock in tribulation.
The word “devil” is a descriptive title, not a proper name.
When in lowercase devil is a reference to evil spirits; those that follow Satan or his policy of evil, which include fallen angels or the spirit of men.
When in Title case “devil” is a reference to Satan (Revelation 12:9 and 20:2). When preceded by the definite article “the” it can be a reference to Satan or another specific individual as the context denotes. As in I Timothy 4:1-3, James 3:15, and I John 3:8-10 wherein God addresses the spirit of men acting on behalf of Satan and his policy of evil that began in Genesis 3.
In Matthew 4:1-11 and Luke 4:1-13, Jesus was tempted of (not by) the devil. God calls the devil that tempted Jesus the prince of the devils. God’s use of the definite article “the” in the passages precludes the need of specifying Satan by name, but God discloses his name in Mark 1:13.
In contrast, and contradictory to Scripture, the prince of the devils in Israel’s religion is Beelzebub, one of Satan’s fallen angels. Jesus says the Jews are Beelzebub’s disciples, and in rejection of God, the Jews say that Jesus is doing Beelzebub’s bidding.