feather duster vs shaving brush

feather duster

noun
  • An implement, traditionally consisting of a bundle of feathers (especially ostrich feathers) attached to a handle, used to remove surface dust. 

shaving brush

noun
  • A small brush used to create a lather from shaving cream or shaving soap and apply it to the face or other area before shaving 

How often have the words feather duster and shaving brush occurred in a corpus of books? (source: Google Ngram Viewer )