rheology vs physics

rheology and physics both are nouns.

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

As nouns, physics is a hypernym of rheology; that is, physics is a word with a broader meaning than rheology:

rheology: the branch of physics that studies the deformation and flow of matter
physics: the science of matter and energy and their interactions

Other hypernyms of rheology include natural philosophy.

rheology (noun)	physics (noun)
the branch of physics that studies the deformation and flow of matter	the science of matter and energy and their interactions
	the physical properties, phenomena, and laws of something