bibliotics vs subject field

bibliotics and subject field both are nouns.

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

As nouns, subject field is a hypernym of bibliotics; that is, subject field 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 field: a branch of knowledge

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

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