television set vs television receiver

television set and television receiver both are nouns.

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

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

television set and television receiver: 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, telly, tv, tv set.

television set (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