Cardiologist

He's a cardiologist.

Tom's doctor referred him to a cardiologist.

"Are you alright?" "I'll be fine. (That is, once I see a cardiologist. I think my heart stopped.)" "Then you must go to the courthouse! Go with many blessings!"

Tom is a cardiologist.

Sami was a promising cardiologist.

Mary's doctor referred her to a cardiologist.

I'm a cardiologist.

He's a certified cardiologist.

Tom isn't a cardiologist.

Tom is now working as a cardiologist.

The homeless guy thus ends up getting treated by one of the best cardiologists in the city.