bathroom vs big white telephone

bathroom

noun

  • A lavatory: a room containing a toilet and (typically but not necessarily) a bathtub. 

  • A room containing a shower and/or bathtub, and (typically but not necessarily) a toilet. 

verb

  • To assist a patient with using the toilet and general personal hygiene. 

big white telephone

noun

  • A toilet, as a receptacle for vomiting. 

How often have the words bathroom and big white telephone occurred in a corpus of books? (source: Google Ngram Viewer )