imperator：绝对统治者，古罗马皇帝，最高统治者 

词根词缀： -imper-统治 + -ator名词词尾

• realisation
• realise
• realism
• realist
• realistic
• reality
• reality TV
• realization
• realize
• reallocate
• really
• realm
• realpolitik
• ream
• reanimate
• reanimation
• reap
• reapply
• reappraise
• rear
• rearguard
• rearing
• rearm
• rearmost
• rearward