What is a suffix added to catastrophe?

There isn't a common suffix specifically added to "catastrophe". However, you could add suffixes to create related words, such as:

* -ic: Catastrophic (adjective)

* -ical: Catastrophical (adjective)

* -ally: Catastrophically (adverb)

* -ize: Catastrophize (verb, to make something into a catastrophe)

Keep in mind that some of these words are less common than others.