noun or subject?

[beachbedbee]

My hobby is bowling.
or
My hobby is playing bowling.
Which is the correct one?

[Barb_D]

Just bowling.

A noun can be a subject or an object. I don't understand the title of your thread.

[beachbedbee]

Thanks.
Bowling can be a noun and a verb too?

[Barb_D]

Yes.

I was bowling when you called and I never heard the phone ring.
Bowling is my favorite hobby.

Verb in the first, noun in the second.