bayonet vs rondel

bayonet

noun
  • A pointed instrument of the dagger kind fitted on the muzzle of a musket or rifle, so as to give the soldier increased means of offence and defence. Originally, the bayonet was made with a handle, which needed to be fitted into the bore of the musket after the soldier had fired. 

  • A pin which plays in and out of holes made to receive it, and which thus serves to engage or disengage parts of the machinery. 

verb
  • To compel or drive by the bayonet. 

  • To stab with a bayonet. 

rondel

noun
  • A long thin medieval dagger with a circular guard and a circular pommel (hence the name). 

  • A small round tower erected at the foot of a bastion. 

  • A metric form of verse using two rhymes, usually fourteen 8- to 10-syllable lines in three stanzas, with the first lines of the first stanza returning as refrain of the next two. 

  • A rondelle, (small) circular object. 

  • The verse form rondeau. 

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