lodestar vs signpost

lodestar

noun
  • A guiding tenet or principle. 

  • A star used as a navigation reference, particularly a pole star such as Polaris. 

  • A calculated amount to award as attorney's fees derived by multiplying the reasonable number of hours spent working on a case by the reasonable hourly billing rate. 

signpost

noun
  • A word or phrase within a clue that serves as an indicator, rather than being fodder. 

  • A post bearing a sign that gives information on directions. 

verb
  • To indicate logical progress of a discourse using words or phrases such as now, right, to recap, to sum up, as I was saying, etc. 

  • To install signposts on. 

  • To signal, as if with a signpost 

  • To direct (somebody) to services, resources, etc. 

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