Hello!
If you are asking someone for the English word for an object or action, there are a few ways to ask:
'What do you call that?'
'What is the name for that?'
'What is the word for that?'
If asking about a verb, the answer would change the verb to a gerund (swimming).
Examples:
Person A: (pointing to a bag) What do you call that?
Person B: This is called a backpack.
Person A: What is the word for when you run really fast?
Person B: That's called sprinting.
I hope this helps you!