artist's workroom vs studio

artist's workroom and studio both are nouns.

Word	Noun	Adjective	Verb	Adverb
artist's workroom	Yes	No	No	No
studio	Yes	No	No	No

As nouns, studio is a hypernym of artist's workroom; that is, studio is a word with a broader meaning than artist's workroom:

artist's workroom (noun)	studio (noun)
a studio especially for an artist or designer	workplace for the teaching or practice of an art
	an apartment with a living space and a bathroom and a small kitchen
	workplace consisting of a room or building where movies or television shows or radio programs are produced and recorded