Are there other “gods”?

Hosea 13:4 NWT

Yet I am Jehovah your God from the land of Egypt,
And you knew no God except me;
For there is no savior besides me.

Isaiah 44:8 NWT

Do not be struck with terror, and do not become paralyzed with fear. Have I not told each of you beforehand and declared it? You are my witnesses. Is there any God but me? No, there is no other Rock; I know not one.

According to Jehovah, is there any God besides him?
Isaiah 9:6 NWT

For a child has been born to us, A son has been given to us; And the rulership will rest on his shoulder. His name will be called Wonderful Counselor, Mighty God, Eternal Father, Prince of Peace.

Who is being called "Mighty God" here?
Isaiah 45:21 NWT

Make your report, present your case.
Let them consult together in unity.
Who foretold this long ago
And declared it from times past?
Is it not I, Jehovah?
There is no other God but me;
A righteous God and a Savior, there is none besides me.

Jesus is called "Mighty God" but here Jehovah says "there is no other God but me"... how can that be?
Revelation 1:8 NWT

I am the Alpha and the Omega, says Jehovah God, the One who is and who was and who is coming, the Almighty.

Who is the Alpha and the Omega and the Almighty?
Revelation 22:12-13 NWT

“‘Look! I am coming quickly, and the reward I give is with me, to repay each one according to his work . I am the Alʹpha and the O·meʹga, the first and the last, the beginning and the end.

Who is the Alpha and the Omega here?
John 20:28 NWT

Next he said to Thomas: “Put your finger here, and see my hands, and take your hand and stick it into my side, and stop doubting but believe.” In answer Thomas said to him: “My Lord and my God!” Jesus said to him: “Because you have seen me, have you believed? Happy are those who have not seen and yet believe.”

Thomas says to Jesus "My Lord and my God". If Jesus is not Jehovah God, why didn't he correct Thomas? Why instead did he confirm it?
John 1:1 NWT

In the beginning was the Word, and the Word was with God, and the Word was a god.

Is Jesus "Mighty God" or "a god"? How many "gods" are there?