bibliotics vs subject area

bibliotics and subject area both are nouns.

Word	Noun	Adjective	Verb	Adverb
bibliotics	Yes	No	No	No
subject area	Yes	No	No	No

As nouns, subject area is a hypernym of bibliotics; that is, subject area is a word with a broader meaning than bibliotics:

bibliotics: the scientific study of documents and handwriting etc. especially to determine authorship or authenticity
subject area: a branch of knowledge

Other hypernyms of bibliotics include bailiwick, discipline, field, field of study, study, subject, subject field.

bibliotics (noun)	subject area (noun)
the scientific study of documents and handwriting etc. especially to determine authorship or authenticity	a branch of knowledge