Resilience-Resiliency | Commonly Confused Words

Resilience

/rɪˈzɪliəns/

The ability to recover or bounce back from difficulties quickly

/rɪˈzɪliənsi/

The ability to recover or bounce back from difficulties or change

Resilience and resiliency both originate from the root resilient, meaning the capacity to recover quickly from difficulties.
Resilience is more commonly used and widely recognized in both American and British English.
Resiliency is often considered a variation or alternative form, predominantly used in American English.
Remember: resilience is more frequently used in general contexts, whereas resiliency might appear in specific technical or academic fields.
You can think of resilience as the default form, with resiliency adding a bonus suffix for niche cases.