"Fun Killer' Phrase [closed]

Can we use the phrase “fun killers” to describe people who watch the new episode of a show and start talking about it in front of their friends, who have not watched it yet, to spoil and ruin the surprising part of the episode?

Does the phrase 'fun-killers' in this context equal the word 'spoilers'? In other words, can I use spoilers and fun-killer interchangeably?

Two words that come to mind for "fun killer" are killjoy, for which the Oxford Dictionaries has

killjoy
NOUN

A person who deliberately spoils the enjoyment of others.
a few killjoys try to reform the seasonal activities

and the other is spoilsport, the Oxford Dictionaries has

spoilsport
NOUN

A person who behaves in a way that spoils others' pleasure, especially by not joining in an activity.
Don't be a spoilsport, Sidney.

Also, giving away a punch line or ending is called a spoiler

spoiler
NOUN

1 A person or thing that spoils something.
If you've not seen it, there's nothing I can say that's not a spoiler.

1.3 A description of an important plot development in a television show, film, or book which if previously known may reduce surprise or suspense for a first-time viewer or reader.
I will try to keep this review as free of spoilers as possible, but the nature of the film requires some revelation.

So you could say:

Don't be such a spoiler. I haven't seen the latest episode yet.