Apex domains cannot have CNAME records.
Question and response
Question
dig cosmotown.com. NS
Answer
cosmotown.com. 2 NS ns-844.awsdns-41.net.
cosmotown.com. 2 NS ns-1311.awsdns-35.org.
cosmotown.com. 2 NS ns-1867.awsdns-41.co.uk.
cosmotown.com. 2 NS ns-265.awsdns-33.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0