reliable vs yo-yo

reliable

adj
  • Suitable or fit to be relied on; worthy of dependence, reliance or trust; dependable, trustworthy 

  • Such that either a sent packet will reach its destination, even if it requires retransmission, or the sender will be told that it didn't 

noun
  • Something or someone reliable or dependable 

yo-yo

verb
  • To vacillate; to move up and down. 

noun
  • 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. 

  • A foolish, annoying or incompetent person. 

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