idiot box vs boob tube

idiot box and boob tube both are nouns.

Word	Noun	Adjective	Verb	Adverb
idiot box	Yes	No	No	No
boob tube	Yes	No	No	No

As nouns, idiot box and boob tube are synonyms defined as:

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

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

idiot box (noun)	boob tube (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