acuminate vs lanceolate

acuminate

adj
  • Tapering to a point; pointed. 

  • Tapering to a long point in concave manner at its apex. 

verb
  • To end in or come to a sharp point. 

  • To render sharp or keen; to sharpen. 

lanceolate

adj
  • Of a class of knapped stone points, made without a stem, shoulders, notches, or other features that aid in attachment to a shaft. 

  • Having the general shape of a lance; much longer than wide, with the widest part lower than the middle and a pointed apex. 

noun
  • Any such artefact 

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