library science vs arts

library science and arts both are nouns.

Word	Noun	Adjective	Verb	Adverb
library science	Yes	No	No	No
arts	Yes	No	No	No

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

library science: the study of the principles and practices of library administration
arts: studies intended to provide general knowledge and intellectual skills (rather than occupational or professional skills)

Other hypernyms of library science include humanistic discipline, humanities, liberal arts.

library science (noun)	arts (noun)
the study of the principles and practices of library administration	studies intended to provide general knowledge and intellectual skills (rather than occupational or professional skills)