assail vs compliment

assail

verb
  • To attack with harsh words or violent force (also figuratively). 

compliment

verb
  • To pay a compliment (to someone); to express a favourable opinion (of someone). 

noun
  • An expression of praise, congratulation, or respect. 

  • Complimentary language; courtesy, flattery. 

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