A decree is something given to someone that is legally an official order. A good sentence would be, the divorce decree was finally filed and finalized.
This power arose only on the granting of a decree of divorce.
My all powerful parents issued a decree that I can't go out on week nights.
To determine the part of speech of the highlighted word "decree," I would need to see the sentence in which it appears. Generally, "decree" can function as a noun (referring to an official order) or as a verb (meaning to officially order something). If you provide the sentence, I can give a more specific answer.
Your nothing but a decree.
I am not writing a sentence using that word.
a sentence using the word endotracheal
This is a sentence using the word aviator.
As a verb: I decree that no one will enter the room with the new carpet while wearing shoes. As a noun: Mother gave the decree, so we have to take off our shoes if we want to watch TV.
We must abide by the consulate's decree.
I am saying a sentence using the word collagen.
this is a sentence using the word armchair.