Meaning : Ornament consisting of a circular rounded protuberance (as on a vault or shield or belt).
Synonyms : stud
Meaning : Heavy pin having a head at one end and the other end being hammered flat after being passed through holes in the pieces that are fastened together.
Meaning : Direct one's attention on something.
Example :
Please focus on your studies and not on your hobbies.
Synonyms : center, centre, concentrate, focus, pore
Meaning : Fasten with a rivet or rivets.
Meaning : Hold (someone's attention).
Example :
The discovery of the skull riveted the paleontologists.