information science vs science

information science and science both are nouns.

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

As nouns, science is a hypernym of information science; that is, science is a word with a broader meaning than information science:

information science: the sciences concerned with gathering, manipulating, storing, retrieving, and classifying recorded information
science: a particular branch of scientific knowledge

Other hypernyms of information science include scientific discipline.

information science (noun)	science (noun)
the sciences concerned with gathering, manipulating, storing, retrieving, and classifying recorded information	a particular branch of scientific knowledge
	ability to produce solutions in some problem domain