Theoretically speaking, you could add your admin account into the
wheel group, then use
visudo to edit the
sudoers file to allow your user account to execute commands as root. Not only would you have root privileges automatically in Terminal, it would also apply to the GUI as well (no more entering passwords when installing packages or unlocking preferences). However, granting root access to any account other than the root user is a Bad Idea and would be the Wrong Thing to do. The security ramifications of doing this are extreme, and could seriously mess up your system if you don't know what you're doing (and even if you do).
But you did want to know if it was possible.