The word angel derives from the Greek angelos, which means 'messenger'. Originating in Zoroastrianism they are found mainly in Christian, Judaic and Islamic writings.
Archangels
The word archangel from Middle English and from Old French is 'archangele' and 'archangelus' from Late Latin.
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Fallen
Fallen angels are angels who no longer reside with God. Generally the most common of these are Lucifer and the other angels who lost the War in Heaven, however sometimes demons, watchers, grigori, devils and goetics are also included as fallen angels.
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Watchers
According to lore there are both 'bad' and 'good' Watchers, however the most famous ones were the two hundred who came to earth and interacted with humankind.
Nephilim,
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