Qual é a diferença entre action e act ?Podes indicar apenas respostas exemplo.

Action is more abstract than act. Act is something specific that is/being/to be done so acts are specific. Action is usually related to effect, will, engagement, or manner so actions are more abstract. Therefore, sometimes act is more about oneself while action could relate to others. We could also say actions speak louder than words but never acts speak louder than words. Also, action could be as an uncountable noun but acts never.
An action could be made up of acts. Actions are usually more complex, lasting. We can say the action of a machine but we can never say an act of a machine. This is because the action of a machine is usually not simple.

There are surely many cases we can use either act or action.