futuristics vs subject field

futuristics and subject field both are nouns.

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

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

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

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

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