combatant vs warfighter

combatant

noun
  • A person engaged in combat, often armed. 

adj
  • Involving combat. 

  • Contending; disposed to contend. 

warfighter

noun
  • A soldier (especially of the United States military). 

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