The answer depends on which activity is being considered:
A spindle can hold thread (spinning) A bobbin can hold thread (sewing machine)
A shuttle can hold thread (weaving)
A needle can hold thread (hand sewing)
etc...
A bobbin or a Spool
A bobbin or a Spool
A Spool
It is a standered fine thread bolt, Grade 8
The small thread in the moss that hold it to the ground are called rhizods.
Spool pins are used on sewing machines to hold the spool of thread. Most or vertical, some that are horizontal use a spool cap to secure the spool of thread. Some machine come with spool nets to cover the spool to ensure the thread enter the machine evenly. Some machines come with an extra spool pin that fits into a small hole on the top of the machine to hold a second spool of thread.
screw thread
It's called a finial.
Shuttles are also called bobbins or loop-takers. This shuttle is a plastic or metal spool that holds the bottom thread in place so the needle can pick up the thread and create a stitch in the fabric.
Replace the head or redrill the hole and retap it for a bigger screw.
To make it stand, she holds it, to make it smooth, she licks it, to make it enter, she pushes it in....it's not easy to thread a needle.
Screws are better. A nail is basically a long smooth cylinder, whereas a screw has a thread cut into it which provides better grip.