Zeus or Thor (3)
I believe the answer is:
god
This clue is a double definition.
'zeus' is the first definition.
(thesaurus)
'thor' is the second definition.
(thesaurus)
(Other definitions for god that I've seen before include "Being upstairs" , "Anubis?" , "Pan perhaps" , "Eg, Quetzalcoatl" , "Supreme being" .)