supination vs rotary motion

supination and rotary motion both are nouns.

Word	Noun	Adjective	Verb	Adverb
supination	Yes	No	No	No
rotary motion	Yes	No	No	No

As nouns, rotary motion is a hypernym of supination; that is, rotary motion is a word with a broader meaning than supination:

supination: rotation of the hands and forearms so that the palms face upward
rotary motion: the act of rotating as if on an axis

Other hypernyms of supination include rotation.

supination (noun)	rotary motion (noun)
rotation of the hands and forearms so that the palms face upward	the act of rotating as if on an axis