Yes, stud is a Scrabble word!

Verb

1. Scatter or intersperse like dots or studs

2. Provide with or construct with studs

Noun

1. A man who is virile and sexually active

2. Ornament consisting of a circular rounded protuberance (as on a vault or shield or belt)

3. An upright in house framing

4. Adult male horse kept for breeding

5. Poker in which each player receives hole cards and the remainder are dealt face up; bets are placed after each card is dealt