An argument is persuasive rhetoric we use when we have a strong opinion about something, whether that is in conversation, or in say, a structured essay.
It is also the word that describes two people disagreeing and shouting at each other. To discuss something means to talk about it peacefully, to argue means to get angry. And the noun of that action is ‘argument’. Argue is just the verb.
There is a similar mistake made with danger, where the noun is incorrectly used as the adjective. You cannot say, ‘It is danger‘, you must use the proper adjective ‘dangerous.‘
So, let’s use both examples together:
A: My neighbours have an argument almost every night.
B: Arguing can be healthy sometimes, but when it’s that often, it is dangerous for the relationship.