radio theater vs radio theatre

radio theater and radio theatre both are nouns.

Word	Noun	Adjective	Verb	Adverb
radio theater	Yes	No	No	No
radio theatre	Yes	No	No	No

As nouns, radio theater and radio theatre are synonyms defined as:

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

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

radio theater (noun)	radio theatre (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.