allayment vs breather

allayment

noun
  • Something that allays; mitigation 

breather

noun
  • Something or someone that breathes. 

  • A short break; a rest or respite. 

  • A spatially localized, time-periodic excitation in a one-dimensional lattice. 

  • An air inlet path to the crankcase 

  • A heavy breather. 

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