Apex domains cannot have CNAME records.
Question and response
Question
dig nw001.com. NS
Answer
nw001.com. 5 NS ns-1580.awsdns-05.co.uk.
nw001.com. 5 NS ns-1198.awsdns-21.org.
nw001.com. 5 NS ns-362.awsdns-45.com.
nw001.com. 5 NS ns-575.awsdns-07.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0