Cascade
Gender: Feminine & Masculine
Usage: English
Pronounced: kas-KAYD
Derived from the English word for a waterfall, ultimately from Latin cadere "to fall".
Serenity
Gender: Feminine
Usage: English (Modern)
Pronounced: sə-REHN-ə-tee
From the English word meaning "serenity, tranquility", ultimately from Latin serenus meaning "clear, calm".