Coma or coma means an unconscious state caused by injury, disease, or poison --
He is still in a coma; we have little hope that he will regain consciousness.
She spent three weeks in a coma, and she hasn't been the same since.
Comma or comma means a punctuation mark ( , ) used to indicate a pause, or a phrase or section of a written sentence --
Use a comma to separate items on a list: "We need to buy bread, milk, and eggs."
A comma should mark the end of one clause or phrase, and the beginning of another: "He couldn't play, but he cheered for the team."
Now that you know that, you can say --
"He was in a coma for several days, and now he pauses when he speaks, as if a comma followed each word."
