Italy used to be a monarchy which is a country ruled by kings and queens
Izzie thought it would be cool for America to have a monarchy, because that way the country could have royals.
the kings government was monarchy.
now we do not have monarchies. his monarchy was not very good for its people.
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The monarchy of Elizabeth I was far different from the monarchy of Elizabeth II.
This pestilence must not threaten the monarchy!
This justifies the use of this word, in a sentence.
The monarchy is crumbling around our feet!
If you know the definition of the word, you should be able to compose a sentence: metonymy is a name that stands for something else with which it is closely associated with. For example: we use crown to refer to a monarchy; brass to refer to the military; and the White House to refer to the U.S. executive branch.
Example sentence - We used a stick to prop the fence up while we repaired it.
The word "ingenuous" would be used in a sentence like the word primitive. A example would be: "He told the truth because he was ingenuous." It can be also used for the phrase "ingenuous question".