Apex domains cannot have CNAME records.
Question and response
Question
dig morventrix.com. NS
Answer
morventrix.com. 5 NS ns-1909.awsdns-46.co.uk.
morventrix.com. 5 NS ns-1110.awsdns-10.org.
morventrix.com. 5 NS ns-382.awsdns-47.com.
morventrix.com. 5 NS ns-574.awsdns-07.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0