Flat, level, even (平)

평화 = peace
태평 = tranquillity, quiet

평온 = calm

공평 = fairness, justice (공= together, public)   
평균 = average, mean (균= equal)

평생 = a lifetime

평소 = usually, ordinarily, everyday (소 = normally)  

평범하다 = plain, simple (범 = general)  

평일 = a weekday

평복 = plain clothes
평민 = commoner

불평 = complaint, dissatisfaction   

평양 = capital of North Korea

평등 = equality (등 = rank)  
불평등 = inequality