The significant difference between metonymy and synecdoche is that metonymy refers to something by the names of concepts or items related to it. In contrast, synecdoche uses a part of something to represent a whole something. Metonymy is a literary device where something is described by the names of items or notions connected to the use of the word.
For example, the word crown is associated with power and authority. Calling the film industry Hollywood is another example of metonymy. A synecdoche is a literary tool that uses a part of something to represent the whole something.
For example, when we say that someone is lending a hand, they are not literally lending a hand. This is the expression used when talking about helping someone. Another typical example is saying the word “wheels” when referring to your car.
Figures of speech are words in the English language that are used for the purpose of providing a rhetorical effect. Two of those figures of speech include Synecdoche and Metonymy. Synecdoche is using a part of a noun to describe the whole thing. An example of this is the sentence "Jane drove by to show off her new wheels." In this sentence, the wheels she is showing off is her car. A metonymy is using a word to describe the related word. An example is "Washington was beating Dallas by 3 points". Washington and Dallas are used to describing the teams, but it is not using their full name.