This is the 3299th most frequent Chinese word.
咳嗽
Cough.
In this usage, "咳嗽" is used as a noun denoting the symptom of coughing experienced by the speaker.
医生说我的咳嗽是因为感冒引起的。
The doctor said my cough is caused by the cold.
In this sentence, "咳嗽" is used as a verb describing the action of coughing.
我今天早上咳嗽了好多次。
I coughed many times this morning.
Here, "咳嗽" serves as a verb indicating the subject's condition of frequent coughing.