Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-14.com. NS
Answer
awsdns-14.com. 5 NS g-ns-1166.awsdns-14.com.
awsdns-14.com. 5 NS g-ns-590.awsdns-14.com.
awsdns-14.com. 5 NS g-ns-15.awsdns-14.com.
awsdns-14.com. 5 NS g-ns-1742.awsdns-14.com.
Authority
The response has no authority records.
Additional
g-ns-15.awsdns-14.com. 5 A 205.251.192.15
g-ns-590.awsdns-14.com. 5 A 205.251.194.78
g-ns-1166.awsdns-14.com. 5 A 205.251.196.142
g-ns-1742.awsdns-14.com. 5 A 205.251.198.206
g-ns-15.awsdns-14.com. 5 AAAA 2600:9000:5300:f00:0:0:0:1
g-ns-590.awsdns-14.com. 5 AAAA 2600:9000:5302:4e00:0:0:0:1
g-ns-1166.awsdns-14.com. 5 AAAA 2600:9000:5304:8e00:0:0:0:1
g-ns-1742.awsdns-14.com. 5 AAAA 2600:9000:5306:ce00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0