glimpse vs obstruct

glimpse

verb
  • To appear by glimpses. 

  • To see or view briefly or incompletely. 

noun
  • A brief look, glance, or peek. 

  • A sudden flash. 

  • A faint idea; an inkling. 

obstruct

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

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

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

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