These end in -té too, but they are masculine.
La sécurité est la chose la plus importante.
Safety is what matters most.
Je me fais des soucis pour sa sécurité.
I am concerned for her safety.
Elle se fait du souci pour ta sécurité.
She's worrying for your safety.
FrenchTextbook teaches rules like this, in a full beginner course.
162 lessons, 4,000+ exercises, and 6+ hours of audio.