futurology vs subject area

futurology and subject area both are nouns.

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

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

futurology: the study or prediction of future developments on the basis of existing conditions
subject area: a branch of knowledge

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

futurology (noun)	subject area (noun)
the study or prediction of future developments on the basis of existing conditions	a branch of knowledge