Apex domains cannot have CNAME records.
Question and response
Question
dig wordpressyoursite.com. NS
Answer
wordpressyoursite.com. 1 NS ns2.wordpressyoursite.com.
wordpressyoursite.com. 1 NS ns1.wordpressyoursite.com.
Authority
The response has no authority records.
Additional
ns1.wordpressyoursite.com. 1 A 172.245.40.55
ns2.wordpressyoursite.com. 1 A 107.172.12.181
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0