information science vs information processing

information science and information processing both are nouns.

Word	Noun	Adjective	Verb	Adverb
information science	Yes	No	No	No
information processing	Yes	No	No	No

As nouns, information science and information processing are synonyms defined as:

information science and information processing: the sciences concerned with gathering, manipulating, storing, retrieving, and classifying recorded information

Other synonyms of information science include informatics, IP.

information science (noun)	information processing (noun)
the sciences concerned with gathering, manipulating, storing, retrieving, and classifying recorded information	the sciences concerned with gathering, manipulating, storing, retrieving, and classifying recorded information