Synonyms for Perquisite (same or very similar meaning)
WordNet sense 1 (an incidental benefit awarded for certain types of employment (especially if it is regarded as a right)):
perk, fringe benefitWordNet sense 2 (a right reserved exclusively by a particular person or group (especially a hereditary or official right)):
prerogative, privilege, exclusive rightFrom the ODE community, based on WordNetadd/edit