lather vs metre

lather

verb
  • To cover with lather. 

  • To form lather or froth, as a horse does when profusely sweating. 

  • To beat or whip. 

noun
  • A state of agitation. 

  • The foam made by rapidly stirring soap and water. 

  • Foam from profuse sweating, as of a horse. 

metre

verb
  • To put into metrical form. 

noun
  • The basic unit of length in the International System of Units (SI: Système International d'Unités), equal to the distance travelled by light in a vacuum in 1/299 792 458 seconds. The metre is equal to 39+⁴⁷⁄₁₂₇ (approximately 39.37) imperial inches. 

  • The rhythm or measure in verse and musical composition. 

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