For expressing the act of believing:
* -ism: This suffix is used to form nouns indicating a belief system, ideology, or doctrine, such as "communism," "capitalism," and "Buddhism."
* -ist: This suffix is used to form nouns indicating a person who adheres to a particular belief system, such as "communist," "capitalist," and "Buddhist."
* -ation: This suffix can be used to form nouns indicating the act of believing or the state of being believed, although it's less common. For example, "belief-creation" could refer to the process of forming a belief.
For expressing the object of belief:
* -ism: This suffix can also be used to form nouns referring to a particular belief or doctrine, such as "realism," "idealism," and "naturalism."
* -ity: This suffix is often used to form nouns indicating a quality or state, and can be used for beliefs, such as "credulity" (gullibility) and "skepticism."
* -hood: This suffix can be used to form nouns indicating a state or condition, and can be used for beliefs, such as "brotherhood" (shared belief in a common cause).
For expressing the outcome of belief:
* -ance: This suffix can be used to form nouns indicating a state of being, and can be used for beliefs, such as "reliance" (dependence on a belief).
* -ence: Similar to "-ance," this suffix can be used to form nouns indicating a state of being, and can be used for beliefs, such as "confidence" (certainty based on belief).
The specific suffix you use will depend on the particular nuance of the word you want to create.