Nouns

(n)stud, rivetornament consisting of a circular rounded protuberance (as on a vault or shield or belt)
(n)rivetheavy 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

Verbs

(v)concentrate, focus, center, centre, pore, rivetdirect one's attention on something“Please focus on your studies and not on your hobbies”
(v)rivetfasten with a rivet or rivets
(v)rivethold (someone's attention)“The discovery of the skull riveted the paleontologists”