photography vs line of work

photography and line of work both are nouns.

Word	Noun	Adjective	Verb	Adverb
photography	Yes	No	No	No
line of work	Yes	No	No	No

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

photography: the occupation of taking and printing photographs or making movies
line of work: the principal activity in your life that you do to earn money

Other hypernyms of photography include business, job, line, occupation.

photography (noun)	line of work (noun)
the act of taking and printing photographs	the principal activity in your life that you do to earn money
the occupation of taking and printing photographs or making movies
the process of producing images of objects on photosensitive surfaces