flattop vs hairdo

flattop

noun
  • A short haircut in which the hair is brushed straight up then cut flat across the top. 

  • An aircraft carrier. 

  • A type of stringed instrument, most often an acoustic guitar, with a flat top (as opposed to an archtop), with strings held in place with pins, and with a complex system of bracing struts on the top. 

hairdo

noun
  • A haircut. 

  • A hairstyle. 

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