tv set vs idiot box

tv set and idiot box both are nouns.

Word	Noun	Adjective	Verb	Adverb
tv set	Yes	No	No	No
idiot box	Yes	No	No	No

As nouns, tv set and idiot box are synonyms defined as:

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

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

tv set (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