Curse
Part of speech: verb
Definition: To place a curse upon (a person or object). To speak or shout a vulgar curse or epithet at someone or something. To use offensive or morally inappropriate language.
Part of speech: noun
Definition: A supernatural detriment or hindrance. A vulgar epithet. A woman's monthly period.
Example sentence: Your competition is not other people but the time you kill, the ill will you create, the knowledge you neglect to learn, the connections you fail to build, the health you sacrifice along the path, your inability to generate ideas, the people around you who don't support and love your efforts, and whatever god you curse for your bad luck.
Cuss
Part of speech: verb
Definition: To use cursing, to use bad language, to speak profanely.
Example sentence: My father was an American who could cuss in Italian and make an aria out of it. It was wonderful to watch. But then again, he was a Gemini. I believe in that stuff.