Here are some examples:
* Constancy: The state of being constant or unchanging.
* Accuracy: The quality of being accurate or correct.
* Reluctancy: The act of being reluctant or unwilling.
* Sufficiency: The state of being sufficient or enough.
It's important to note that "-ancy" is often used with words that already have a noun form, such as "constant," "accurate," "reluctant," and "sufficient."