Question

What is the difference between metonymy and synecdoche in the following sentences?He has many mouths to feed

Answer 1

here synecdoche means the person doesn't just have to feed the mouths(here it means persons) but has to look after them. The word feed is used as a part of whole.

here metonymy means the person actually doesn't has to feed just mouths. The mouths actually refers to many persons.

hope it helps you out mate!