acicular vs lanceolate

acicular

adj
  • Having sharp points like needles. 

  • Of a leaf, slender and pointed, needle-like. 

  • Needle-shaped; slender like a needle or bristle. 

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 acicular and lanceolate occurred in a corpus of books? (source: Google Ngram Viewer )