idiot box vs television

idiot box and television both are nouns.

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

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

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

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

idiot box (noun)	television (noun)
an electronic device that receives television signals and displays them on a screen	a telecommunication system that transmits images of objects (stationary or moving) between distant points
	an electronic device that receives television signals and displays them on a screen
	broadcasting visual images of stationary or moving objects