graphology vs subject area

graphology and subject area both are nouns.

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

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

graphology: the study of handwriting (especially as an indicator of the writer's character or disposition)
subject area: a branch of knowledge

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

graphology (noun)	subject area (noun)
the study of handwriting (especially as an indicator of the writer's character or disposition)	a branch of knowledge