sports means relating to sport, as in sports equipment; dictionaries also record it as the plural of sport, the North American English form for activity done for pleasure that needs physical effort or skill.
Cambridge Dictionary marks sports an adjective used before a noun and defines it as "relating to sport," with the examples "sports equipment" and "It's the school sports day on Monday." Its American Dictionary, marking the adjective not gradable, defines it as "connected with sports," as in "He only reads the sports section of the newspaper."
Dictionary.com lists sports as the "plural of sport" and defines the adjective as "of or relating to a sport or sports, especially of the open-air or athletic kind" and, of garments and equipment, "suitable for use in open-air sports or for outdoor or informal use." It gives the origin "First recorded in 1910–15; sport + -s."
The Oxford Advanced Learner's Dictionary defines sport as "activity that you do for pleasure and that needs physical effort or skill, usually done in a special area and according to fixed rules," marking it uncountable in British English, with the North American English form sports, plural. Its note states that "When talking about sport or sports in general, the form is usually the uncountable sport in (British English) and the plural sports in (North American English)," and that "before another noun the plural form sports is used in both," as in "a radio station for sports fans." Its North American English example is "Do you play any sports?"