drilling rig vs implement

drilling rig

noun
  • Used other than figuratively or idiomatically: see drilling, rig. 

  • An oil rig. 

implement

noun
  • A tool or instrument for working with. 

verb
  • To bring about; to put into practice; to carry out. 

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