Apex domains cannot have CNAME records.
Question and response
Question
dig greenhomeoutlet.com. NS
Answer
greenhomeoutlet.com. 1 NS ns1.greenhomeoutlet.com.
greenhomeoutlet.com. 1 NS ns2.greenhomeoutlet.com.
Authority
The response has no authority records.
Additional
ns1.greenhomeoutlet.com. 1 A 216.106.177.103
ns2.greenhomeoutlet.com. 1 A 216.106.177.138
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0