Which of the following words is closest in meaning to “Expletive”?

Expletive means a swear word.

• Correct answer - swear word: it has the same meaning as Expletive.
• detailed description: a full account - wrong, it does not mean the same as Expletive.
• self-explanatory: clear without further explanation - wrong, it does not mean the same as Expletive.
• excuse: a reason offered for a fault - wrong, it does not mean the same as Expletive.