How do I make auto correct to stop a word that I have already correctly typed?

[Trush Jodie]

I have typed this word and auto correct always changes it to "ducking", making me to stress and re-type. It is a swear word, I know. But is it not possible for auto-correct to come to accept it by now?

How do I make auto correct to stop changing swear words that I typed correctly on my phone?

 

[kit_hung]

I enter those words into dictionary so the phone can recognize my movements. That prevents the hassle of having to adjust every hour I write a quick text message because I want to have a command on my phone every day.