The function f(x) is highly selective for words related to the sport of golf, such as "driver," "PGA," "putter," "iron," "wedge," "caddie," and "Masters." Additionally, it shows some association with sports brands like "Nike" and "Adidas," as well as vehicle brands like "Ferrari," "Porsche," and "Lamborghini" to a lesser degree. The function does not exhibit high selectivity for other sports, transportation-related words, or categories like animals, food, emotions, or technology.