ass-licking vs slavish

ass-licking

noun
  • Sycophancy. 

  • Anilingus. 

slavish

adj
  • in the manner of a slave; abject 

  • utterly faithful; totally lacking originality, creativity, or reflection 

How often have the words ass-licking and slavish occurred in a corpus of books? (source: Google Ngram Viewer )