Apex domains cannot have CNAME records.
Question and response
Question
dig nw027.com. NS
Answer
nw027.com. 5 NS ns-1878.awsdns-42.co.uk.
nw027.com. 5 NS ns-1207.awsdns-22.org.
nw027.com. 5 NS ns-14.awsdns-01.com.
nw027.com. 5 NS ns-702.awsdns-23.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0