Examples of Screws
Some screws have a sharp point and are mostly used on wood.
The faucet has threads to screw the hose on.
Some screws have a flat end. We call these screws bolts. Most bolts use a nut.
Many bottles and jars have screw on lids.
Bicycle tires have threads on the stem to screw the cap on.
Light bulbs have threads to screw them into sockets.