radio theater vs audio drama

radio theater and audio drama both are nouns.

Word	Noun	Adjective	Verb	Adverb
radio theater	Yes	No	No	No
audio drama	Yes	No	No	No

As nouns, radio theater and audio drama are synonyms defined as:

radio theater and audio drama: a dramatized, purely acoustic performance, broadcast on radio or published on audio media, such as tape or CD.

Other synonyms of radio theater include radio drama, radio theatre.

radio theater (noun)	audio drama (noun)
a dramatized, purely acoustic performance, broadcast on radio or published on audio media, such as tape or CD.	a dramatized, purely acoustic performance, broadcast on radio or published on audio media, such as tape or CD.