I contend that the WORD 'God' can be used a verb to mean 'Ruling/Ruler', 'Sovereign', 'Mightiest'. 'Most powerful', etc..
If I say 'A judge is God in his courtroom', what am I saying about the judge?
If I say, 'A monarch is God of his kingdom', what am I implying about the king?
If I say, 'God is God of all Gods', what are all the meanings of the three 'God's in that sentence?
My contention stem from a debate where no one seems able to respond with anything other than that 'God' is a person who is 'triune' (they won't even finish the sentence by saying '...triune RULER over heaven and Earth'.
Notice that in each of the example sentences there is a frame that limits the context of the 'GODSHIP'... 'Courtroom', 'Family', 'kingdom'. Of course, 'The God of heaven' is not really 'framed' but I still use the same principle.
The problem with responding, Hermes, is that you write:
"...the WORD 'God' can be used a verb to mean..."
We can't tell whether you intended to say:
"...the WORD 'God' can be used AS A verb to mean…"
or
"...the WORD 'God' can be used WITH a verb to mean…"
I would rewrite your last sentence, "God is God of all Gods"
as
'God is the god of all gods'
'God" is the actual name of the Christian god.
'god' is a superhuman being or spirit worshipped as having power over nature or human fortunes; a deity.
Of all these superhuman beings (gods), God is the god who is more superhuman than any of the other gods.