Apex domains cannot have CNAME records.
Question and response
Question
dig amwordpress.org. NS
Answer
amwordpress.org. 5 NS ns-452.awsdns-56.com.
amwordpress.org. 5 NS ns-1411.awsdns-48.org.
amwordpress.org. 5 NS ns-1592.awsdns-07.co.uk.
amwordpress.org. 5 NS ns-1918.awsdns-47.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0