expletive

The Parson blurted an expletive, inflected like the profane.

This expletive was certainly not appreciated by her who used it.

When the word devil is used as a general term or as an expletive the capital is not used.

He drawled the expletive as though it were some Oriental word.

I think it was “hang” he said—I was not sure about the expletive.

I employed an expletive which I am happy to think has not escaped me for years.

She winced at his expletive, which seemed to hint of something stronger, and so was just as bad.

Every expletive that should have been forgotten, I remembered.

She breathed the expletive she learned from her latest companions.

In this use, there is sometimes called an expletive (or filler).