Gossip and rumor

Hi!

My dictionary says that words 'gossip' and 'rumor' are basically uncountable nouns. However these words are used as countable nouns sometimes.

I think all of the following sentences are correct. Do you agree with it?

There is gossip that they may get divorced.
There is a gossip that they may get divorced.
There is rumor that they may get divorced.
There is a rumor that they may get divorced.

Thank you very much for your opinion.

All the best,

Tom

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