Nekros
Nekros is a Greek word that means deadly, deathly, or dead.
Since "silent" and "deadly" are two unrelated concepts both Latin and classical Greek would need two words to translate them.
Food Poisoning
Deadly is an adjective.
The Latin word for deadly is mortifera.
I know that a snake's venom is deadly.
cause it has the word deadly in it
yes
The Greek word for experience is εμπειρία (empeiría).
the greek word for egg is: avgo
That fast girl's name was Atalanta.
It is not. It is a Latin adjective, mortalis, meaning deadly.