God
Gods
noun, proper noun
God (formal name ender) is God! Or the gods, if you're talking to more than one. You have to be polite to them, so you add that ender on there.
かみさま
The readings for this word are both kun'yomi readings. You've learned them both already so you should be able to read this too!
あの神様、まだおむかえを待ってるの？
Is that god still waiting for someone to come and get him?
ギターの神様と言えば、だれを思いうかべますか？
Who comes to your mind when you hear the name "guitar god."
あれは多分神様のいたずらだったのだろう。
That's probably just the god of mischief.