physics vs mechanics

physics and mechanics both are nouns.

Word	Noun	Adjective	Verb	Adverb
physics	Yes	No	No	No
mechanics	Yes	No	No	No

As nouns, mechanics is a hyponym of physics; that is, mechanics is a word with a more specific, narrower meaning than physics:

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

physics (noun)	mechanics (noun)
the science of matter and energy and their interactions	the technical aspects of doing something
the physical properties, phenomena, and laws of something	the branch of physics concerned with the motion of bodies in a frame of reference