pinecone vs strobilus

pinecone

noun
  • A seed-bearing conical fruit of a pine tree. 

strobilus

noun
  • A cone-shaped fruiting body in general 

  • More particularly a more-or-less cone-shaped fruiting body of any of various gymnosperms and vascular sporophytes. According to source and context it might refer to a structure bearing either seeds or spores, that might or might not be seen as an infructescence; usage has varied arbitrarily among authors during the last two centuries. 

  • A layered reproductive stage in jellyfish, in which the swimming medusa form is produced. 

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