hassock vs cushion

hassock and cushion both are nouns.

Word	Noun	Adjective	Verb	Adverb
hassock	Yes	No	No	No
cushion	Yes	No	Yes	No

As nouns, cushion is a hypernym of hassock; that is, cushion is a word with a broader meaning than hassock:

hassock: a cushion for kneeling on (as when praying in church)
cushion: a soft bag filled with air or a mass of padding such as feathers or foam rubber etc.

hassock (noun)	cushion (noun)
a cushion for kneeling on (as when praying in church)	a soft bag filled with air or a mass of padding such as feathers or foam rubber etc.
thick cushion used as a seat	a mechanical damper; absorbs energy of sudden impulses
	the layer of air that supports a hovercraft or similar vehicle

hassock (verb)	cushion (verb)
	protect from impact