drudge vs slog

drudge

verb
  • To labour in (or as in) a low servile job. 

noun
  • A person who works in a low servile job. 

  • Someone who works for (and may be taken advantage of by) someone else. 

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 drudge and slog occurred in a corpus of books? (source: Google Ngram Viewer )