There is only one devil (Satin). Daemon - the Greek form, rendered "devil". Daemons are spoken of as spiritual beings at enmity with God, and as having a certain power over man. They recognize our Lord as the Son of God . They belong to the number of those angels that "kept not their first estate," "unclean spirits," "fallen angels," the angels of the devil . Demons are followers of Satin when he revolted against God. They are the "principalities and powers" against which we must "wrestle".
Revelation 012:007 And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels, 012:008 And prevailed not; neither was their place found any more in heaven. 012:009 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. Ephesians 006:012 For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places. James 2:19 Thou believest that there is one God; thou doest well: the devils also believe, and tremble. Matthew 008:016 When the even was come, they brought unto him many that were possessed with devils: and he cast out the spirits with his word, and healed all that were sick: 010:001 And when he had called unto him his twelve disciples, he gave them power against unclean spirits, to cast them out, and to heal all manner of sickness and all manner of disease. 012:043 When the unclean spirit is gone out of a man, he walketh through dry places, seeking rest, and findeth none. 012:044 Then he saith, I will return into my house from whence I came out; and when he is come, he findeth it empty, swept, and garnished. 012:045 Then goeth he, and taketh with himself seven other spirits more wicked than himself, and they enter in and dwell there: and the last state of that man is worse than the first. Even so shall it be also unto this wicked generation. Luke 4:41 004:041 And devils also came out of many, crying out, and saying, Thou art Christ the Son of God. And he rebuking them suffered them not to speak: for they knew that he was Christ. Matthew 025:041 Then shall he say also unto them on the left hand, Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels: