candleholder vs electrolier

candleholder

noun
  • A device for holding one or more lit candles 

  • A person who holds a candle to assist another person who is working in dim light. 

electrolier

noun
  • A fixture, usually hanging from the ceiling, for holding electric lamps. 

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