See also Angel
An angel is simply a spiritual being that serves God. Within this order of beings, there appears to be a separation of some from the others into positions of authority one over overs. These “archangels” are leaders over the angels, and/or possibly also authorities over positions and ministries, like an archangel over each nation as in Daniel.
In my book on angels, I make the point that “angel” is a difficult concept to understand. There is the possibility that “angel” is a general broad concept that gathers up in that all of the spiritual beings at the service of God. Demons were angels, but nowhere are demons or “fallen angels” ever referred to as “angel”. They lost they name in losing their relationship with their Creator. So possibly all good spiritual being are called angels. The other possibility is that there are a hole host of spiritual being that serve God Cheribum, Seraphim, Angels, etc. and angels are only one single “part” or member of this host. This makes more sense because technically, an angel is a messenger, and those spiritual beings that are not used as messengers, and stand around the throne of God shouting “Holy, Holy, Holy” are not technically an angel.
This world is only twice used in the Bible, 1Th 4:16; Jude 1:9. In this last passage it is applied to Michael, who, in Da 10:13, 21; 12:1, is described as having a special charge of the Jewish nation, and in Rev 12:7-9 as the leader of an angelic army. So exalted are the position and offices ascribed to Michael, that many think the Messiah is meant.
Michael the Archangel
In Daniel he is called ‘one of the chief princes,’ ‘your prince,’ ‘the great prince which standeth for the children of thy people.’ He went to the assistance of one (probably an angel) who had been sent with a message to Daniel, but who had been detained twenty-one days by the prince of the kingdom of Persia (doubtless Satan, or one of Satan’s angels, who was acting for the kingdom of Persia, as Michael was prince for the children of Israel). Da 10:13,21 12:1. It is also said of Michael that when he contended with Satan about the body of Moses, he durst not bring a railing accusation against him, but said, “The Lord rebuke thee.” Michael and his angels will however fight with Satan and his angels, and will prevail, and Satan will be cast out of that portion of heaven to which he now has access. Jude 9 Re 12:7 : cf. Job 1:6 2:1. These are illustrations of the conflict of good and evil spirits in the unseen universe.
“is not found in the OT, and in the NT only in 1Th 4:16 and Jud 1:9, where it is used of Michael, who in Daniel is called ‘one of the chief princes,’ and ‘the great prince’ (Sept., ‘the great angel’), Dan 10:13, Dan 10:21; Dan 12:1. Cp. also Rev 12:7 …. Whether there are other beings of this exalted rank in the heavenly hosts, Scripture does not say, though the description ‘one of the chief princes’ suggests that this may be the case; cp. also Rom 8:38; Eph 1:21; Col 1:16, where the word translated ‘principalities’ is arche, the prefix in archangel.” * [* From Notes on Thessalonians, by Hogg and Vine, pp. 142.] In 1Th 4:16 the meaning seems to be that the voice of the Lord Jesus will be of the character of an “archangelic” shout.