The word, angel, may also be rendered as messenger, and many times isjust that. Sometimes it is the spiriit of a person, or of God, such Angels of the Lord as when visiting Sodom, another time when the Apostles say Jesus Yeshua walking on the water, one declared, "It must be His Angel."
Words and their etymologies can be tricky, but more often they inform, only to those who will hear the information.