accustomed vs habitual

accustomed

adj
  • Familiar through use; usual; customary. 

  • Familiar with something through repeated experience; adapted to existing conditions. 

habitual

adj
  • Of or relating to a habit; established as a habit; performed over and over again; recurrent, recurring. 

  • Pertaining to an action performed customarily, ordinarily, or usually. 

  • Of a person or thing: engaging in some behaviour as a habit or regularly. 

  • Regular or usual. 

noun
  • One who does something habitually, such as a serial criminal offender. 

  • A construction representing something done habitually. 

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