physics vs physical science

physics and physical science both are nouns.

Word	Noun	Adjective	Verb	Adverb
physics	Yes	No	No	No
physical science	Yes	No	No	No

As nouns, physics and physical science are synonyms defined as:

physics and physical science: the physical properties, phenomena, and laws of something

physics (noun)	physical science (noun)
the science of matter and energy and their interactions	the physical properties, phenomena, and laws of something
the physical properties, phenomena, and laws of something