Suffixes are word parts added to the end of a word to change its meaning or grammatical function. "Cite" is already a complete word and doesn't have any added endings.
If you're looking for related words, you might be thinking of:
* Citation: This is a noun formed by adding the suffix "-ation" to "cite".
* Citable: This is an adjective formed by adding the suffix "-able" to "cite".
Let me know if you have any other words you'd like to explore!