information science vs informatics

information science and informatics both are nouns.

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

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

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

Other synonyms of information science include information processing, IP.

information science (noun)	informatics (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