How do seraphim in Isaiah 6 relate to the cherubim? After reading Isaiah chapter 6 I came across the spiritual beings named seraphim.

I have been introduced to other spiritual beings before, such as cherubim, a being that we have a variety of references.

However, the only reference that I saw of seraphim was in Isaiah chapter 6 and they are described to perform a role similar to the cherubim, with some variations, as they have 6 wings (instead of 2 or 4).

But I am struggling to understand what are the seraphims and if they relate to cherubim?



Cherubim

From Genesis 3:24 we can see that cherubim are the guardians between heaven and earth.


  After sending them out, the Lord God stationed mighty cherubim to the east of the Garden of Eden. And he placed a flaming sword that flashed back and forth to guard the way to the tree of life.


From Psalms 99:1 we read that they support Yahweh's throne:


  The Lord is king!
      Let the nations tremble! He sits on his throne between the cherubim.
      Let the whole earth quake!


From Ezekiel 9:3:


  Then the glory of the God of Israel rose up from between the cherubim,
  where it had rested, and moved to the entrance of the Temple. And the
  Lord called to the man dressed in linen who was carrying the writer’s
  case.


And Ezekiel 10:1, that they carry his throne-chariot that appears to prophets on earth.


  In my vision I saw what appeared to be a throne of blue lapis lazuli
  above the crystal surface over the heads of the cherubim. 




I came across this thread, however it doesn't answer my question.
According to The New Unger's Bible Dictionary, definition of Cherub


  They do not seem to be identical with the seraphim (Isa. 6:2). The cherubim apparently have to do with the holiness of God as
  violated by sin; the seraphim with uncleanness in the people of God.