studio apartment vs studio

studio apartment and studio both are nouns.

Word	Noun	Adjective	Verb	Adverb
studio apartment	Yes	No	No	No
studio	Yes	No	No	No

As nouns, studio apartment and studio are synonyms defined as:

studio apartment and studio: an apartment with a living space and a bathroom and a small kitchen

studio apartment (noun)	studio (noun)
an apartment with a living space and a bathroom and a small kitchen	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