Apex domains cannot have CNAME records.
Question and response
Question
dig worldhost.group. NS
Answer
worldhost.group. 5 NS wesley.ns.cloudflare.com.
worldhost.group. 5 NS cass.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
cass.ns.cloudflare.com. 4 A 108.162.192.81
cass.ns.cloudflare.com. 4 A 172.64.32.81
cass.ns.cloudflare.com. 4 A 173.245.58.81
wesley.ns.cloudflare.com. 4 A 108.162.193.246
wesley.ns.cloudflare.com. 4 A 172.64.33.246
wesley.ns.cloudflare.com. 4 A 173.245.59.246
cass.ns.cloudflare.com. 4 AAAA 2606:4700:50:0:0:0:adf5:3a51
cass.ns.cloudflare.com. 4 AAAA 2803:f800:50:0:0:0:6ca2:c051
cass.ns.cloudflare.com. 4 AAAA 2a06:98c1:50:0:0:0:ac40:2051
wesley.ns.cloudflare.com. 4 AAAA 2606:4700:58:0:0:0:adf5:3bf6
wesley.ns.cloudflare.com. 4 AAAA 2803:f800:50:0:0:0:6ca2:c1f6
wesley.ns.cloudflare.com. 4 AAAA 2a06:98c1:50:0:0:0:ac40:21f6
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0