freelance vs specialize

freelance

verb
  • To produce or sell services as a freelance. 

  • To work as a freelance. 

adj
  • Of, or relating to a freelance; without employment contract. 

noun
  • A medieval mercenary. 

  • Someone who sells their services to clients without a long-term employment contract. 

specialize

verb
  • To focus one's business upon a particular item or service. 

  • To become distinct or separate from what is common 

  • To focus one's study upon a particular skill, field, topic, or genre. 

  • To make distinct or separate due to form or function. 

  • To narrow in scope. 

  • To be known or notorious for some specialty. 

  • To specify: to mention specifically. 

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