caster vs trolley

caster

noun
  • The angle of the axis around which a car's front wheels rotate when the steering wheel is turned, with a vertical axis being defined as zero caster. 

  • A shaker with a perforated top for sprinkling condiments such as sugar, salt, pepper, etc. 

  • A stand to hold a set of shakers or cruets. 

  • A wheeled assembly attached to a larger object at its base to facilitate rolling. A caster usually consists of a wheel (which may be plastic, a hard elastomer, or metal), an axle, a mounting provision (usually a stem, flange, or plate), and sometimes a swivel (which allows the caster to rotate for steering). 

  • Someone or something that casts. 

verb
  • To act as a caster 

trolley

noun
  • A handcar. 

  • A streetcar or light train. 

  • A truck from which the load is suspended in some kinds of cranes. 

  • A soapbox car. 

  • A trolley pole; a single-pole device for collecting electrical current from an overhead electrical line, normally for a tram/streetcar or a trolleybus. 

  • A truck which travels along the fixed conductors in an electric railway, and forms a means of connection between them and a railway car. 

  • A light rail, tramway, trolleybus or streetcar system. 

  • A gurney, a stretcher with wheeled legs. 

  • A hand truck. 

  • A cart or shopping cart; a shopping trolley. 

verb
  • To bring to by trolley. 

  • To travel by trolley (streetcar, trolleybus or light train). 

  • To use a trolley vehicle to go from one place to another. 

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