practice vs test flight

practice

noun
  • Actual operation or experiment, in contrast to theory. 

  • A customary action, habit, or behaviour; a manner or routine. 

  • The ongoing pursuit of a craft or profession, particularly in medicine or the fine arts. 

  • A place where a professional service is provided, such as a general practice. 

  • The observance of religious duties that a church requires of its members. 

  • An organized event for the purpose of performing such repetition. 

  • The form, manner, and order of conducting and carrying on suits and prosecutions through their various stages, according to the principles of law and the rules laid down by the courts. 

  • Skilful or artful management; dexterity in contrivance or the use of means; stratagem; artifice. 

  • Repetition of an activity to improve a skill. 

  • A easy and concise method of applying the rules of arithmetic to questions which occur in trade and business. 

test flight

noun
  • a proving flight; usually of a prototype of a new aircraft design before it goes into production. 

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