General Usage:
* Agency: The capacity to act or exert power.
* Currency: The state of being in general use or circulation.
* Efficiency: The ability to produce a desired result with the least waste of time and effort.
* Frequency: The rate at which something occurs over a particular period of time.
* Latency: The delay between a stimulus and a response.
* Sufficiency: The state of being enough or adequate.
* Transparency: The quality of being open and honest.
* Urgency: The state of being of great importance or requiring immediate action.
Other Examples:
* Abeyance: A state of temporary suspension or inactivity.
* Adjacency: The state of being next to or near something.
* Crescency: The state of becoming increasingly loud or intense.
* Fluency: The ability to speak or write smoothly and easily.
* Incompetency: The state of being unable or unfit to perform a task.
* Inconsistency: The state of being contradictory or lacking in uniformity.
* Intimacy: The state of being close or familiar.
* Resiliency: The ability to recover readily from difficulties.
* Tendency: An inclination or predisposition towards a particular behavior.
Technical Usage:
* Concordance: A detailed list of words or phrases and their locations in a text.
* Concurrence: The state of agreement or harmony.
* Decadence: A state of moral or cultural decline.
* Eminence: A position of high rank or distinction.
* Impedence: The opposition to the flow of electrical current.
* Opulence: Great wealth or luxuriousness.
* Prevalence: The widespread occurrence of something.
This is not an exhaustive list, but it provides a good starting point for understanding words ending in "-ency."