Super Gloss and Spot UV are coatings that leave a glossy finish.
The main difference is the application - Super Gloss is applied as a flood, which is throughout the entire surface, and Spot UV is applied to specific areas only. See: What is Spot UV?
Super Gloss is available on a variety of stocks. Spot UV is only available on 14pt Semi Gloss or 16pt Smooth Matte Laminate.