It is an important word that defines an important concept. To be a statist is to support tyranny. For the statist the state is the means to power and control. So we have a vast regulatory state created of the statists, by the statists, and for the statists that devours our wealth and our liberty.
The Conservative, in my opinion really has only one central, one core belief. All governments must be tightly constrained, limited by written documents, charters or constitutions. The individual's liberty is more important than the state's compulsion to dominate, to control, to coerce its citizens.
All other issues are mere details.