Viv.., as you say the ancients had many things they would refer to as spirit, I am talking specifically about one aspect of what they identified as spirit they obviously were ignorant of the scientific make up of the air we breathe , any other ancient idea of what they thought spirit was is just speculation or interpreted by some eg bible writers as supernatural.
Likewise ancient people , although having in their appropriate language a word for water they did not know it as hydrogen and oxygen, therefore you cannot conclude that H2o is a metaphor for water. They are the same thing.
Best wishes