airhead vs yo-yo

airhead

noun
  • A foolish, silly, or unintelligent person. 

  • A (usually temporary) landing area for aircraft for supplying a non-military operation. 

  • An area of hostile territory that has been seized for use as an airbase to ensure the further safe landing of troops and materiel. 

yo-yo

noun
  • A foolish, annoying or incompetent person. 

  • A toy consisting of a spheroidal or cylindrical spindle having a circular groove in which string is wound; it is used by holding the string in the fingers and reeling the spindle up and down by movements of the wrist. 

  • A cloth rosette formed by gathering the outside edge of a circle of fabric in toward the centre using a running stitch. 

  • Someone who vacillates. 

  • A dogfighting maneuver involving the attacker temporarily exchanging altitude for airspeed, or vice versa, in order to rapidly catch up with the defender or to prevent an overshoot. 

  • A volatile market that moves up and down. 

verb
  • To vacillate; to move up and down. 

How often have the words airhead and yo-yo occurred in a corpus of books? (source: Google Ngram Viewer )