physics vs mechanical stress

physics and mechanical stress both are nouns.

Word	Noun	Adjective	Verb	Adverb
physics	Yes	No	No	No
mechanical stress	Yes	No	No	No

physics (noun)	mechanical stress (noun)
the science of matter and energy and their interactions	elastic stress (any deformation of a solid material) and viscous stress (the gradual changing of the deformation) combined.
the physical properties, phenomena, and laws of something