descent vs overpass

descent

noun
  • A sloping passage or incline. 

  • A particular extension of the idea of gluing. 

  • A falling upon or invasion. 

  • A drop to a lower status or condition; decline. 

  • Lineage or hereditary derivation. 

  • An instance of descending; act of coming down. 

  • A way down. 

overpass

noun
  • A section of a road or path that crosses over an obstacle, especially another road, railway, etc. 

verb
  • To pass above something, as when flying or moving on a higher road. 

  • To exceed, overstep, or transcend a limit, threshold, or goal. 

  • To disregard, skip, or miss something. 

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