The firm upholstered cushion for kneeling on is commonly referred to as a "knee pad" or "knee cushion." These cushions are designed to provide comfort and support for the knees during activities that involve prolonged kneeling. They are often used in gardening, construction, or other tasks where kneeling is required.
Kneeling cushions are called hassocks
Hassock
The scientific name of a cushion starfish is Culcita novaeguineae.
Za Rei
An air-cushion vehicle is an alternative name for a hovercraft.
Za-rei
An etui.
Bank
Hassock
If the man's name is Doug Cushion, and you're talking about him and you say, "Cushion is coming by this afternoon," then in that case, Cushion is a proper noun. Otherwise, it's just a noun.
Marital Aid
Pteraster tesselatus