What is difference between prophet and messenger?

All messengers mentioned in the Quran are also prophets, but not all prophets are messengers.

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And another question, who is a messenger in christianity?

Messenger Of Christianity, Jesus Of Nazareth. How many angels are in heaven now? The Bible suggests that there are at least 400 million. It calls them myriads upon myriads, with one myriad amounting to about 10,000 or an indeterminately higher number.

Who is God's right hand angel?

Enoch was instrumental in establishing the pre-eminent place of Michael among the angels or archangels, and in later Jewish works he is said to be their chief, mediating the Torah (the law of God) and standing at the right hand of the throne of God. Who is God's highest angel? Seraphim are the highest angelic class and they serve as the caretakers of God's throne and continuously sing praises to God of "Holy, holy, holy is the Lord Almighty; the whole earth is full of his glory."

In respect to this, who are the 7 fallen angels?

The fallen angels are named after entities from both Christian and Pagan mythology, such as Moloch, Chemosh, Dagon, Belial, Beelzebub and Satan himself. Following the canonical Christian narrative, Satan convinces other angels to live free from the laws of God, thereupon they are cast out of heaven.