caulking vs rubber stamp

caulking

noun
  • A sealing material used to seal joints between heterogeneous materials in many kinds of construction and manufacture. 

rubber stamp

noun
  • A piece of rubber or similar material with a design or text carved or molded for the purpose of transferring ink or dye to imprint that design on another object. 

  • A person or organisation that approves, routinely or as a formality, matters decided by some other person or organisation. 

adj
  • Of a person, organisation, or process, making decisions or approving matters routinely or without real power. 

verb
  • To process, approve or decide matters routinely rather than through careful consideration. 

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