domain vs Grub Street

domain and Grub Street both are nouns.

Word	Noun	Adjective	Verb	Adverb
domain	Yes	No	No	No
Grub Street	Yes	No	No	No

As nouns, Grub Street is a hyponym of domain; that is, Grub Street is a word with a more specific, narrower meaning than domain:

domain: people in general; especially a distinctive group of people with some shared interest
Grub Street: the world of literary hacks

Other hyponyms of domain include academe, academia.

domain (noun)	Grub Street (noun)
the content of a particular field of knowledge	the world of literary hacks
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