erratic vs peculiar

erratic

adj
  • Deviating from normal opinions or actions; eccentric; odd. 

  • Unsteady, random; prone to unexpected changes; not consistent. 

noun
  • A rock moved from one location to another, usually by a glacier. 

  • Anything that has erratic characteristics. 

peculiar

adj
  • Out of the ordinary; odd; strange; unusual. 

  • Common or usual for a certain place or circumstance; specific or particular. 

noun
  • an ecclesiastical district, parish, chapel or church outside the jurisdiction of the bishop of the diocese in which it is situated. 

  • That which is peculiar; a sole or exclusive property; a prerogative; a characteristic. 

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