television set vs television

television set and television both are nouns.

Word	Noun	Adjective	Verb	Adverb
television set	Yes	No	No	No
television	Yes	No	No	No

As nouns, television set and television are synonyms defined as:

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

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

television set (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