graphology vs subject field

graphology and subject field both are nouns.

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

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

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

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