locus vs placement

locus

noun
  • A place or locality, especially a centre of activity or the scene of a crime. 

  • A fixed position on a chromosome that may be occupied by one or more genes. 

  • The set of all points whose coordinates satisfy a given equation or condition. 

  • A passage in writing, especially in a collection of ancient sacred writings arranged according to a theme. 

placement

noun
  • A location or position. 

  • A temporary posting of a person to a particular workplace to enable them to gain work experience. 

  • The zodiacal region of the sky in which the sun, moon, or a planet appears at the time and place of a person's birth. 

  • The act of matching a person with a job 

  • The act of placing or putting in place; the act of locating or positioning; the state of being placed. 

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