All 16 words, sorted alphabetically. Group them into four categories of four.
The four category names, easiest to hardest. No words revealed yet.
Theme name plus one word from each category.
BAR, BENCH, COURT, and TRIBUNAL are all terms used to refer to parts or aspects of the legal system — the bar is the legal profession, the bench refers to judges, the court is the judicial body, and a tribunal is a formal legal panel.
BASEBALL GLOVE, CORSET, FOOTBALL, and SHOE all have laces — a baseball glove is laced together, a corset is laced up the back, a football has laces for grip, and shoes are tied with laces.
EXTREME, MOTOR, RACKET, and WATER can all precede 'sports' to form recognized categories: extreme sports, motor sports, racket sports, and water sports.
BREATHING, ELBOW, HEAD, and WIGGLE all precede 'room' to form compound words or phrases meaning extra space: breathing room, elbow room, headroom, and wiggle room.