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subject field vs domain domain vs subject field

subject field and domain both are nouns.

As nouns, domain is a hypernym of subject field; that is, domain is a word with a broader meaning than subject field and subject field is a type of domain with the definitions:
  • a branch of knowledge
Other hypernyms of subject field include knowledge base, knowledge domain.
subject field (noun) domain (noun)
a branch of knowledge a particular environment or walk of life
territory over which rule or control is exercised
(mathematics) the set of values of the independent variable for which a function is defined
people in general; especially a distinctive group of people with some shared interest
the content of a particular field of knowledge