specialize vs write down

specialize

verb
  • To specify: to mention specifically. 

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

write down

verb
  • To condemn in writing; to document the faults, offenses, or wrongdoing of. 

  • Used other than figuratively or idiomatically: see write, down. 

  • To produce or set (something) down in writing; to record something. 

  • To write (something) in a simple or condescending style. 

  • To make a downward adjustment in the value of an asset. 

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