moonlight vs slog

moonlight

verb
  • To engage in an activity other than what one is known for. 

  • To work on the side (at a secondary job), often in the evening or during the night. 

  • To perform a secondary function substantially different from its supposed primary function, as in protein moonlighting. 

noun
  • The light reflected from the Moon. 

slog

verb
  • To work slowly and deliberately at a tedious task. 

  • To strike something with a heavy blow, especially a ball with a bat. 

  • To walk slowly, encountering resistance. 

noun
  • A long, tedious walk, or session of work. 

  • An aggressive shot played with little skill. 

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