architecture vs field of study

architecture and field of study both are nouns.

Word	Noun	Adjective	Verb	Adverb
architecture	Yes	No	No	No
field of study	Yes	No	No	No

As nouns, field of study is a hypernym of architecture; that is, field of study 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
field of study: a branch of knowledge

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

architecture (noun)	field of study (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