library science vs liberal arts

library science and liberal arts both are nouns.

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

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

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

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

library science (noun)	liberal 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)