abet vs obstruct

abet

verb
  • To incite; to assist or encourage by aid or countenance in crime. 

  • To support, countenance, maintain, uphold, or aid (any good cause, opinion, or action); to maintain. 

obstruct

verb
  • To impede, retard, or interfere with; hinder. 

  • To get in the way of so as to hide from sight. 

  • To block or fill (a passage) with obstacles or an obstacle. See synonyms at block. 

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