The difference between "Certificate of Entrepreneur of the Year" and "Certificate for the Entrepreneur of the Year" lies in the prepositions "of" and "for," which slightly alter the meaning of the phrases.
"Certificate of Entrepreneur of the Year": This phrase suggests that the certificate itself is called "Entrepreneur of the Year." The focus is on the title of the certificate. This construction might be less common and can sound a bit awkward.
"Certificate for the Entrepreneur of the Year": This phrase indicates that the certificate is being awarded to the person who has been recognized as the Entrepreneur of the Year. The focus is on the purpose of the certificate, which is to honor the recipient. This construction is more common and sounds more natural.
In most cases, it would be preferable to use "Certificate for the Entrepreneur of the Year" as it more clearly conveys the purpose of the certificate and sounds more natural.