Words from
caper
    a playful leap or skip.
    
    Source: Sophie's World - Jostein Gaarder
    
    dialectic
    the art of investigating or discussing the truth of opinions.
    
    Source: Sophie's World - Jostein Gaarder
    
    viable
    capable of working successfully; feasible.
    
    Source: Sophie's World - Jostein Gaarder
    
    interplay
    the way in which two or more things have an effect on each other.
    
    Source: Sophie's World - Jostein Gaarder