architecture vs subject field

architecture and subject field both are nouns.

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

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

architecture: the discipline dealing with the principles of design and construction and ornamentation of fine buildings
subject field: a branch of knowledge

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

architecture (noun)	subject field (noun)
the profession of designing buildings and environments with consideration for their esthetic effect	a branch of knowledge
an architectural product or work
(computer science) the structure and organization of a computer's hardware or system software
the discipline dealing with the principles of design and construction and ornamentation of fine buildings