deoxidation vs retrenchment

deoxidation

noun
  • The process of extracting the oxygen content of a dissolved oxide, or of removing dissolved oxygen, with the aid of a reducing agent. 

retrenchment

noun
  • An act of reducing expenses; economizing. 

  • A curtailment or reduction. 

  • An act of terminating the employment of a worker or making an employee redundant, often to reduce expenses; a layoff. 

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