The term "ism" is often used as a suffix in the English language to denote a distinctive practice, system, or philosophy. It usually signifies a movement or ideology that advocates a particular set of beliefs or principles.
Nationalism, on the other hand, is a specific political ideology and movement characterized by the promotion of the interests of a particular nation, often in opposition to foreign influence or control. It emphasizes the collective identity of a nation based on shared culture, language, history, or ethnicity, and typically seeks to foster national unity and pride.
In summary, while "ism" broadly refers to a set of beliefs or practices, nationalism specifically pertains to the ideology that prioritizes the interests of a nation and its people.