Cheribum are created entities no doubt, but I don't think we can call them angels...
All the pictures we see show human men and women, with wings...The biblical references to angels are always depicted as men...Even in Hebrews, it says if we met an angel, we wouldn't recognize it as an angel, apparently because they look like human men...
There is no mention in the bible of cheribum as having any of the attributes of angels...Not to mention they are pretty tall...
The bible's pretty clear that angels do not have wings...
Here's a description of some other 'things' which I don't think would be a class of angel either...Angels are angels...These cheribum and these other things are something else...
Eze 1:5 Also out of the midst thereof came the likeness of four living creatures. And this was their appearance; they had the likeness of a man.
Eze 1:6 And every one had four faces, and every one had four wings.
Eze 1:7 And their feet were straight feet; and the sole of their feet was like the sole of a calf's foot: and they sparkled like the color of burnished brass.
Eze 1:8 And they had the hands of a man under their wings on their four sides; and they four had their faces and their wings.
Eze 1:9 Their wings were joined one to another; they turned not when they went; they went every one straight forward.
Eze 1:10 As for the likeness of their faces, they four had the face of a man, and the face of a lion, on the right side: and they four had the face of an ox on the left side; they four also had the face of an eagle.
Eze 1:11 Thus were their faces: and their wings were stretched upward; two wings of every one were joined one to another, and two covered their bodies.
Eze 1:12 And they went every one straight forward: whither the spirit was to go, they went; and they turned not when they went.
Eze 1:13 As for the likeness of the living creatures, their appearance was like burning coals of fire, and like the appearance of lamps: it went up and down among the living creatures; and the fire was bright, and out of the fire went forth lightning.
Eze 1:14 And the living creatures ran and returned as the appearance of a flash of lightning.
The verse refers to 'for some have entertained Angels unawares.' This is linked in my Scofield Standard Reference Bible to the episode when the two Angels came to Abram's camp and he entertained them as traditional hospitality required, and Sarah laughed in private at their prediction (of her giving birth) unaware that they were Angels. Gideon also was visited by an Angel who appeared as 'manish'.
An Angel rolled back the stone of Jesus' tomb, an Angel released the door and chains that bound Apostles. The reference you cited doesn't mean that in every case Angels are unidentifiable.
The Angel in the desert led the Hebrews as a cloud during the day and a column of fire at night. A heavenly host of Angels appeared to the shepherds heralding the birth of the Lord. These appearances were not misundertood as something other than Angels. If you happen to find references to Angels in the Bible that do not appear at roughly human size, THAT is what I'm seeking to explore. Thanks for your patience ...