The word skill is a noun. Skill means (1) ability to produce solutions in some problem domain, (2) an ability that has been acquired by training.
The following articles and web pages elaborate on the word skill.
Cake decorating is a highly sought-after culinary skill, and every cake is unique! Cakes can be iced with butter cream, royal, fondant, or cooked icings, and may feature various embellishments as well.