The Collaborative International Dictionary of English v.0.48:

Royalism \Roy"al*ism\, n. [Cf. F. royalisme.]
   the principles or conduct of royalists.
   [1913 Webster]

WordNet (r) 3.0 (2006):

royalism
    n 1: adherence or attachment to a monarchy or to the principle
         of monarchal government

Moby Thesaurus II by Grady Ward, 1.0:

43 Moby Thesaurus words for "royalism":
   Bourbonism, Nazism, Toryism, backwardness, centralism,
   collectivism, communism, conservatism, conservativeness,
   constitutionalism, democratism, die-hardism, extreme right,
   extreme right wing, extreme rightism, fascism, federalism,
   feudalism, feudality, governmentalism, imperialism,
   know-nothingism, laissez-faireism, monarchism, national socialism,
   neofascism, old school tie, parliamentarianism, parliamentarism,
   pluralism, political principles, radical rightism, reaction,
   reactionariness, reactionaryism, republicanism, rightism,
   social Darwinism, socialism, standpattism, statism,
   ultraconservatism, unprogressiveness