photography vs physical process

photography and physical process both are nouns.

Word	Noun	Adjective	Verb	Adverb
photography	Yes	No	No	No
physical process	Yes	No	No	No

As nouns, physical process is a hypernym of photography; that is, physical process is a word with a broader meaning than photography:

photography: the process of producing images of objects on photosensitive surfaces
physical process: a sustained phenomenon or one marked by gradual changes through a series of states

Other hypernyms of photography include process.

photography (noun)	physical process (noun)
the act of taking and printing photographs	a sustained phenomenon or one marked by gradual changes through a series of states
the occupation of taking and printing photographs or making movies
the process of producing images of objects on photosensitive surfaces