metonym
Pronunciation:
/ˈmɛtənɪm/noun
Definitions
(grammar) A word that names an object from a single characteristic of it or of a closely related object; a word used in metonymy.
Example: Calling a government "city hall" is using a metonym.
(by extension) A concept, idea, or word used to represent, typify, or stand in for a broader set of ideas.