So being a Power Word Stun 5E Spell You can speak a word of power which can overwhelm the mind of one creature which you can see within a range and also leaving it to dumbfounded. For an instance if the target has 150 hit points or even fewer, it is stunned then. Otherwise, that specific spell does not have any effect.
Actually, the stunned target should make a constitution saving throw at the end of each of its turns. So on a successful save, this stunning effect will be end.
You can also read freedom of movement spell 5e
Attributes Of Power Word Stun 5E Spell
|Casting Time||1 action|
|Classes||Bard, Sorcerer, Warlock, Wizard|
|Name||Power Word Stun|
|Target||One creature you can see within range|