hired gun vs thrill-seeker

hired gun

noun
  • A person who is employed as an armed guard, enforcer, or mercenary and who is prepared to use gunplay or similar violent methods in order to assert the interests of his or her employer. 

  • A person who is employed to advance the interests of his or her employer, especially in a vigorous manner using such methods as political lobbying, legal advocacy, or persuasion. 

thrill-seeker

noun
  • A person who enjoys thrilling situations, or who engages in dangerous sports 

How often have the words hired gun and thrill-seeker occurred in a corpus of books? (source: Google Ngram Viewer )