opposition
This word carries a sense of active friction. It is not merely a difference of opinion, but a structural or intentional force that pushes back against a prevailing movement. In a political context, it describes a formal role of scrutiny and challenge, where the goal is to provide a check on power.
In a physical or logical sense, it evokes a visual of two forces facing each other head-on. This creates a feeling of tension and stalemate, where neither side can advance without overcoming the other. It is more confrontational than "difference" and more organized than "disagreement."
Uncountable when referring to the general feeling of resistance (There was much opposition). Countable when referring to the specific people or groups who resist (The various oppositions in the region).
Meanings
A state of disagreement or resistance to a plan or person.
The proposal met with strong opposition from the local community.
Examples
The new tax law faced fierce opposition from small business owners.
The leader of the opposition criticized the prime minister's latest policy.
There is a sharp opposition between the two different artistic styles.