Entertaiment is a word that you can use in different situations, it can be a word of enjoyment or a word that focuses on social backstabbing, murders and other themes that the brain was shaped to react deeply to. Entertaiment can also be something that makes you forget all your problems and gives you a euphoric feeling in which you wish that the experience never ends, just lasts forever.
You may sometimes see this word abbreviated as entmt on fliers, in industry news publications, or in short hand note taking where space is limited. However, this is not common and it is usually not used in general prose.