humanities vs subject area

humanities and subject area both are nouns.

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

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

humanities: studies intended to provide general knowledge and intellectual skills (rather than occupational or professional skills)
subject area: a branch of knowledge

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

humanities (noun)	subject area (noun)
studies intended to provide general knowledge and intellectual skills (rather than occupational or professional skills)	a branch of knowledge