-ism

-ism is a suffix in many English words, originally derived from the Ancient Greek suffix -ισμός(-ismós), and reaching English through the Latin -ismus, and the French -isme. It means “taking side with” or “imitation of”, and is often used to describe philosophies, theories, religions, social movements, artistic movements and behaviors. The suffix “-ism” is neutral and therefore bears no connotations associated with any of the many ideologies it identifies; such determinations can only be informed by public opinion regarding specific ideologies.

The concept of an -ism may resemble that of a grand narrative.

via wikipedia

First ones I thought of:
capitalism
marxism
alcoholism
fundamentalism
extremism
miserablism
terrorism
antagonism
denialism
escapism