informatics vs information science

informatics and information science both are nouns.

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

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

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

Other synonyms of informatics include information processing, IP.

informatics (noun)	information science (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