Metonymy is a figure of speech in which something is referred to by a term that is closely associated with it. For example, using "the White House" to refer to the President of the United States.
Metonomy is a figure of speech closely related to synecdoche. It replaces something with which it is closely associated. For example, businesspersons are often referred to as suits, because suits serve as a representation of business.
"The pen is mightier than the sword." In this example, "pen" is used as a metonymy for writing or literature, while "sword" represents warfare or military force.
They are both genres. eventhough Non Fiction speaks of Facts partly, it may have elements of imagination, on the other hand Fiction is based on Reality although there is further construction of imagination. Unexpressable truths, desires which are suppressed into unconscious mind are channelised into literature and art despite superficially those seem fiction but those have many facts associated with author's emotions, feelings either in the form of metonomy or or symbolic.
A metonymy is a word or phrase used to replace and refer to another word or phrase. A metonymy breaks up the awkwardness of repeating the same thing over and over. It changes the wording and makes a sentence more interesting.Examples of metonymy:Uncle Sam, meaning the governmentLend a hand, meaning helping outCarving the bird, meaning carving the turkeyHe's a porker, meaning he is obese
The style of writing poetry differs from person to person; long or short meters, three or four lines to a stanza. But the great thing is, no matter how a poem is written it still holds great emotion. Some techniques used in poetry are onomatopoeia, alliteration, assonance, rhyming, simile and metaphor.