STUDS

A male animal, especially a stud horse (stallion), kept for breeding.

A female animal, especially a studmare (broodmare), kept for breeding.

(also by extension) A group of such animals.

A small object that protrudes from something; an ornamental knob.

"a collar with studs"

(jewelry) A small round earring.

"She's wearing studs in her ears."

A vertical post, especially one of the small uprights in the framing for lath and plaster partitions, and furring, and upon which the laths are nailed.

A person who studies or learns about a particular subject.

"He is a student of life."

A person who is formally enrolled at a school, a college or university, or another educational institution.

A pair of shoes or boots which have studs on the bottom to aid grip.

"He wore his studs to play soccer."

Tires/tyres with metal protrusions used for improved traction on snow and ice in winter.

"Many US states have outlawed studs due to the damage they cause to paved roads."