{"era":"current","word":"trooper","meaning":"a soldier of private rank in cavalry or armor; by extension, a mounted police officer","children":[{"era":"1200s","word":"troop","meaning":"a body of soldiers; a company","children":[{"era":"1200s","word":"troupe","meaning":"company; troop","children":[],"language":"Old French"}],"language":"Middle English"},{"era":"pre-1100","word":"-er","meaning":"agent noun suffix","children":[],"language":"Old English"}],"language":"Modern English"}