scientific knowledge vs domain

scientific knowledge and domain both are nouns.

Word	Noun	Adjective	Verb	Adverb
scientific knowledge	Yes	No	No	No
domain	Yes	No	No	No

As nouns, domain is a hypernym of scientific knowledge; that is, domain is a word with a broader meaning than scientific knowledge:

scientific knowledge: knowledge accumulated by systematic study and organized by general principles
domain: the content of a particular field of knowledge

Other hypernyms of scientific knowledge include knowledge base, knowledge domain.

scientific knowledge (noun)	domain (noun)
knowledge accumulated by systematic study and organized by general principles	the content of a particular field of knowledge
	people in general; especially a distinctive group of people with some shared interest
	(mathematics) the set of values of the independent variable for which a function is defined
	territory over which rule or control is exercised
	a particular environment or walk of life