Answer:
There's one in every deck of cards and in a famous movie
Sometimes you feel it weigh a ton. Yet it is nothing, but somehow still there. Makes you uncomfortable around anyone, But speak its name and it's gone.
There are four of these, but everyone's favorite seems to be spades.
I start with āeā end with āeā. I have whole countries inside me. What am I?
Power enough to smash ships and crush roofs. Yet it still must fear the sun.
People take me on walks and I run and have fun. What am I?