stamina
exercise
Depending on context, "exercise" can mean train, apply, wield, exert, etude
exercise
exercise
CAX Combined Arms Exercise
It sounds like you are referring to the word eterne.Eterne is an archaic word which means "eternal".It comes from the Latin word, aeternus.
I've is a word that means I have. I'll is a word that means I will.
manatees
The four letter word that means, "I forbid," is veto.veto
A ten letter word that means equal to is equivalent.
Brave is a five-letter word that means gallant.
The word that means a species of animals or plants is not longer in existence is extinct. Animals that are no longer plentiful, might be called endangered.