Term: fifth wheel: an extra car wheel and tire for a four-wheel vehicle
Broader: mechanism: device consisting of a piece of machinery; has moving parts that perform some function | Unrelated: savanna: a flat grassland in tropical or subtropical regions
Broader: mechanism: device consisting of a piece of machinery; has moving parts that perform some function | Unrelated: spanish monetary unit: monetary unit in Spain
Broader: mechanism: device consisting of a piece of machinery; has moving parts that perform some function | Unrelated: backhand drive: a hard straight return made on the backhand side
Broader: mechanism: device consisting of a piece of machinery; has moving parts that perform some function | Unrelated: deuterium: an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen)
Broader: mechanism: device consisting of a piece of machinery; has moving parts that perform some function | Unrelated: whitewash: a defeat in which the losing person or team fails to score
Broader: mechanism: device consisting of a piece of machinery; has moving parts that perform some function | Unrelated: bib-and-tucker: an attractive outfit
Broader: mechanism: device consisting of a piece of machinery; has moving parts that perform some function | Unrelated: right fielder: the person who plays right field
Broader: mechanism: device consisting of a piece of machinery; has moving parts that perform some function | Unrelated: transmittance: the fraction of radiant energy that passes through a substance
Broader: mechanism: device consisting of a piece of machinery; has moving parts that perform some function | Unrelated: gymnopilus validipes: a poisonous fungus with a dry cap and a cortina that does not leave much of a ring on the robust stalk
Broader: mechanism: device consisting of a piece of machinery; has moving parts that perform some function | Unrelated: welcher: someone who swindles you by not repaying a debt or wager