discouraging vs lowering

discouraging

adj

  • that causes discouragement 

noun

  • discouragement 

lowering

adj

  • That lowers or frowns. 

  • Dark and menacing. 

  • Lurking, skulking, menacing. 

noun

  • The act of something being lowered. 

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