arts vs subject field

arts and subject field both are nouns.

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

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

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

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

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