Angels and Saint?

One of my loyal readers asked me this question. I had no idea, so I set him on the task. File this with your lesson plan on the angels for next year. It's a great question!

here's the answer a priest friend of mine found for me:
Q. Why are some angels, like St. Michael, considered Saints and others are just angels?

People think that only humans can be Saints. It is true that normally we think only of humans becoming Saints. According to the dictionary, the word "saint" is derived from the Latin sanctus, which means holy or sacred. An angel is a purely spiritual being and as such is noted for being holy. Heaven is the place where the angels who surround God live, along with the saints. The three angels which we refer to as "Saints" are the only three who are named in Holy Scripture. Michael remained faithful to God and led the victory against the fallen angels (Revelation 12:7-9). Gabriel announced to the Blessed Virgin Marythat she was to bear the Son of God (Luke 1:26-38). Raphael identified himself as "one of the seven holy angels who present the prayers of the saints and enterinto the presence of the glory of the Holy One" (Tobit 12:15, RSV-CE). They are referred to as Saints because they are holy, they dwell with God, and they have a name to which we can add the title of "Saint."