erratic vs practical

erratic

adj
  • Deviating from normal opinions or actions; eccentric; odd. 

  • Unsteady, random; prone to unexpected changes; not consistent. 

noun
  • A rock moved from one location to another, usually by a glacier. 

  • Anything that has erratic characteristics. 

practical

adj
  • Light fixtures used for set lighting and seen in the frame of a shot as part of the scenery. 

  • Being likely to be effective and applicable to a real situation; able to be put to use. 

  • Of a prop: having some degree of functionality, rather than being a mere imitation. 

  • Of a person, having skills or knowledge that are practical. 

  • Relating to, or based on, practice or action rather than theory or hypothesis. 

noun
  • A prop that has some degree of functionality, rather than being a mere imitation. 

  • A light fixture used for set lighting and seen in the frame of a shot as part of the scenery. 

  • A part of an exam or series of exams in which the candidate has to demonstrate their practical ability 

  • Laboratory experiment, test or investigation 

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