Some DNS CNAME's are unreachable

Hi,
Some CName entries do not work when I enter them.

C Name “root” works.
C Name “wroot” does not work. (cannot ping)
C Name “groot” does not work. (cannot ping)
C Name “yroot” works.
C Name “aroot” works.
C Name “proot” works.

Is there such a thing as reserved words for CName entries?
I googled and could not find anything.

Thanks

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