carpet vs subfloor

carpet

noun
  • Any surface or cover resembling a carpet or fulfilling its function. 

  • Any of a number of moths in the geometrid subfamily Larentiinae 

  • A fabric used as a complete floor covering. 

  • A woman's pubic hair. 

verb
  • To reprimand. 

  • To substantially cover something, as a carpet does; to blanket something. 

  • To lay carpet, or to have carpet installed, in an area. 

subfloor

noun
  • The floor structure supporting and underlying the visible flooring or other finishing surface such as a carpet 

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