Apex domains cannot have CNAME records.
Question and response
Question
dig uc-workd.com. NS
Answer
uc-workd.com. 5 NS princess.ns.cloudflare.com.
uc-workd.com. 5 NS uriah.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0