pronation vs rotary motion

pronation and rotary motion both are nouns.

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

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

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

Other hypernyms of pronation include rotation.

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