xerography vs picture taking

xerography and picture taking both are nouns.

Word	Noun	Adjective	Verb	Adverb
xerography	Yes	No	No	No
picture taking	Yes	No	No	No

As nouns, picture taking is a hypernym of xerography; that is, picture taking is a word with a broader meaning than xerography:

xerography: forming an image by the action of light on a specially coated charged plate; the latent image is developed with powders that adhere only to electrically charged areas
picture taking: the act of taking and printing photographs

Other hypernyms of xerography include photography.

xerography (noun)	picture taking (noun)
forming an image by the action of light on a specially coated charged plate; the latent image is developed with powders that adhere only to electrically charged areas	the act of taking and printing photographs