television receiver vs idiot box

television receiver and idiot box both are nouns.

Word	Noun	Adjective	Verb	Adverb
television receiver	Yes	No	No	No
idiot box	Yes	No	No	No

As nouns, television receiver and idiot box are synonyms defined as:

television receiver and idiot box: an electronic device that receives television signals and displays them on a screen

Other synonyms of television receiver include boob tube, goggle box, television, television set, telly, tv, tv set.

television receiver (noun)	idiot box (noun)
an electronic device that receives television signals and displays them on a screen	an electronic device that receives television signals and displays them on a screen