sax vs saxophone

sax

noun
  • A slate-cutter’s hammer; slate-ax. 

verb
  • To cut or slash with a sharp instrument; incise; scarify. 

saxophone

noun
  • A single-reed instrument musical instrument of the woodwind family, usually made of brass and with a distinctive loop bringing the bell upwards. 

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