noun

• One who helps; an aide; assistant; auxiliary.
• That which helps; anything serving to assist.
• (Singapore, Hong Kong) A person who does cleaning and cooking in a family home, or in a market; domestic employee.
• (rail transport, US) A locomotive that assists a train, usually on steep gradients.
• A city in Carbon County, Utah, United States, which got its name from the practice of the Denver & Rio Grande Railroad of attaching helper engines to trains there.
• A surname; variant of Halpern or Helfer.