mechanics vs natural philosophy

mechanics and natural philosophy both are nouns.

Word	Noun	Adjective	Verb	Adverb
mechanics	Yes	No	No	No
natural philosophy	Yes	No	No	No

As nouns, natural philosophy is a hypernym of mechanics; that is, natural philosophy is a word with a broader meaning than mechanics:

mechanics: the branch of physics concerned with the motion of bodies in a frame of reference
natural philosophy: the science of matter and energy and their interactions

Other hypernyms of mechanics include physics.

mechanics (noun)	natural philosophy (noun)
the technical aspects of doing something	the science of matter and energy and their interactions
the branch of physics concerned with the motion of bodies in a frame of reference