Synonyms for Possession (same or very similar meaning)
WordNet sense 1 (a mania restricted to one thing or idea):
monomaniaWordNet sense 2 (the trait of resolutely controlling your own behavior):
self-command, self-control, self-possession, self-will, willpowerWordNet sense 3 (the act of having and controlling property):
ownershipFrom the ODE community, based on WordNetadd/edit