Metonymy, as its name implies, is to borrow one thing to replace another, so most of the borrowed pronouns are nouns. Generally speaking, metonymy is a rhetorical method of borrowing people or things closely related to metonymy when speaking or writing articles, rather than directly saying what you want to express. What is replaced is called "ontology" and what is replaced is called "borrowing". When "ontology" does not appear, it is replaced by "borrowing body". The following figure shows an example.

Monuments are noumenon, stones are borrowed. You know, monuments are also made of stone, but the definition of stone is broader.

metaphor

Definition:

Describe or explain things A with things B similar to things A. ..

We can distinguish it from the definition. Metonymy refers to borrowing people or things that are closely related to it, while metaphor does not need to be closely related, as long as it is similar. Let's look at the example of metaphor in the picture below.

The dancer's skirt has nothing to do with the leaves, they only have some similarities.