idiot box vs television receiver

idiot box and television receiver both are nouns.

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

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

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

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

idiot box (noun)	television receiver (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