Sputa is a medical word for the stuff that comes out of your mouth when you cough or sneeze.
Sputa is usually thought of as gross and a sign of being sick.
Examples:
The doctor looked at the sputa to see what was wrong.
When you are sick, you might have to give the doctor a sample of your sputa.
The sputa was green and sticky.
I don't want to touch the sputa!
The sputa was so gross, it could fill a whole bucket.
The sputa was so colorful, it looked like a rainbow.